diff --git a/colour/algebra/coordinates/tests/test_transformations.py b/colour/algebra/coordinates/tests/test_transformations.py
index 7baea7ce0b..45b0f5d2a9 100644
--- a/colour/algebra/coordinates/tests/test_transformations.py
+++ b/colour/algebra/coordinates/tests/test_transformations.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.algebra.coordinates.transformations` module.
 """
 
diff --git a/colour/algebra/tests/test_interpolation.py b/colour/algebra/tests/test_interpolation.py
index 572a2976ea..9381b57ce0 100644
--- a/colour/algebra/tests/test_interpolation.py
+++ b/colour/algebra/tests/test_interpolation.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.algebra.interpolation` module.
+Define the unit tests for the :mod:`colour.algebra.interpolation` module.
 
 References
 ----------
diff --git a/colour/algebra/tests/test_prng.py b/colour/algebra/tests/test_prng.py
index a3c6e8d152..8ffe85b5d6 100644
--- a/colour/algebra/tests/test_prng.py
+++ b/colour/algebra/tests/test_prng.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.algebra.prng` module.
+Define the unit tests for the :mod:`colour.algebra.prng` module.
 
 References
 ----------
diff --git a/colour/biochemistry/tests/test_michaelis_menten.py b/colour/biochemistry/tests/test_michaelis_menten.py
index 2f1bf7ac0f..c594f33bf3 100644
--- a/colour/biochemistry/tests/test_michaelis_menten.py
+++ b/colour/biochemistry/tests/test_michaelis_menten.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.biochemistry.michaelis_menten`
+Define the unit tests for the :mod:`colour.biochemistry.michaelis_menten`
 module.
 """
 
diff --git a/colour/characterisation/tests/test_correction.py b/colour/characterisation/tests/test_correction.py
index 7b32ff60d0..d034262a1e 100644
--- a/colour/characterisation/tests/test_correction.py
+++ b/colour/characterisation/tests/test_correction.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.characterisation.correction`
+Define the unit tests for the :mod:`colour.characterisation.correction`
 module.
 """
 
diff --git a/colour/colorimetry/tests/test_transformations.py b/colour/colorimetry/tests/test_transformations.py
index 584b3cdd39..18bb54c80d 100644
--- a/colour/colorimetry/tests/test_transformations.py
+++ b/colour/colorimetry/tests/test_transformations.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.colorimetry.transformations`
+Define the unit tests for the :mod:`colour.colorimetry.transformations`
 module.
 """
 
diff --git a/colour/colorimetry/tests/test_tristimulus_values.py b/colour/colorimetry/tests/test_tristimulus_values.py
index 7ced95b854..80bcbb5392 100644
--- a/colour/colorimetry/tests/test_tristimulus_values.py
+++ b/colour/colorimetry/tests/test_tristimulus_values.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.colorimetry.tristimulus_values`
+Define the unit tests for the :mod:`colour.colorimetry.tristimulus_values`
 module.
 
 References
diff --git a/colour/difference/tests/test_delta_e.py b/colour/difference/tests/test_delta_e.py
index 26aee34132..bf5a779a08 100644
--- a/colour/difference/tests/test_delta_e.py
+++ b/colour/difference/tests/test_delta_e.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.difference.delta_e` module.
+Define the unit tests for the :mod:`colour.difference.delta_e` module.
 
 References
 ----------
diff --git a/colour/models/rgb/transfer_functions/filmic_pro.py b/colour/models/rgb/transfer_functions/filmic_pro.py
index c56e569b24..e1e42bf1a4 100644
--- a/colour/models/rgb/transfer_functions/filmic_pro.py
+++ b/colour/models/rgb/transfer_functions/filmic_pro.py
@@ -94,7 +94,7 @@ def log_encoding_FilmicPro6(t: FloatingOrArrayLike) -> FloatingOrNDArray:
     return as_float(from_range_1(y))
 
 
-_LOG_DECODING_FILMICPRO_INTERPOLATOR_CACHE: Optional[Extrapolator] = None
+_CACHE_LOG_DECODING_FILMICPRO_INTERPOLATOR: Optional[Extrapolator] = None
 
 
 def _log_decoding_FilmicPro6_interpolator() -> Extrapolator:
@@ -109,15 +109,15 @@ def _log_decoding_FilmicPro6_interpolator() -> Extrapolator:
         function interpolator.
     """
 
-    global _LOG_DECODING_FILMICPRO_INTERPOLATOR_CACHE
+    global _CACHE_LOG_DECODING_FILMICPRO_INTERPOLATOR
 
     t = np.arange(0, 1, 0.0001)
-    if _LOG_DECODING_FILMICPRO_INTERPOLATOR_CACHE is None:
-        _LOG_DECODING_FILMICPRO_INTERPOLATOR_CACHE = Extrapolator(
+    if _CACHE_LOG_DECODING_FILMICPRO_INTERPOLATOR is None:
+        _CACHE_LOG_DECODING_FILMICPRO_INTERPOLATOR = Extrapolator(
             LinearInterpolator(log_encoding_FilmicPro6(t), t)
         )
 
-    return _LOG_DECODING_FILMICPRO_INTERPOLATOR_CACHE
+    return _CACHE_LOG_DECODING_FILMICPRO_INTERPOLATOR
 
 
 def log_decoding_FilmicPro6(y: FloatingOrArrayLike) -> FloatingOrNDArray:
diff --git a/colour/models/rgb/transfer_functions/filmlight_tlog.py b/colour/models/rgb/transfer_functions/filmlight_tlog.py
index a8f49bb611..1bc2721db6 100644
--- a/colour/models/rgb/transfer_functions/filmlight_tlog.py
+++ b/colour/models/rgb/transfer_functions/filmlight_tlog.py
@@ -108,13 +108,13 @@ def log_encoding_FilmLightTLog(
 
     x = to_domain_1(x)
 
-    b = 1.0 / (0.7107 + 1.2359 * np.log(w * g))
-    gs = g / (1.0 - o)
+    b = 1 / (0.7107 + 1.2359 * np.log(w * g))
+    gs = g / (1 - o)
     C = b / gs
-    a = 1.0 - b * np.log(w + C)
+    a = 1 - b * np.log(w + C)
     y0 = a + b * np.log(C)
-    s = (1.0 - o) / (1.0 - y0)
-    A = 1.0 + (a - 1.0) * s
+    s = (1 - o) / (1 - y0)
+    A = 1 + (a - 1) * s
     B = b * s
     G = gs * s
 
@@ -202,13 +202,13 @@ def log_decoding_FilmLightTLog(
 
     t = to_domain_1(t)
 
-    b = 1.0 / (0.7107 + 1.2359 * np.log(w * g))
-    gs = g / (1.0 - o)
+    b = 1 / (0.7107 + 1.2359 * np.log(w * g))
+    gs = g / (1 - o)
     C = b / gs
-    a = 1.0 - b * np.log(w + C)
+    a = 1 - b * np.log(w + C)
     y0 = a + b * np.log(C)
-    s = (1.0 - o) / (1.0 - y0)
-    A = 1.0 + (a - 1.0) * s
+    s = (1 - o) / (1 - y0)
+    A = 1 + (a - 1) * s
     B = b * s
     G = gs * s
 
diff --git a/colour/models/rgb/transfer_functions/tests/test__init__.py b/colour/models/rgb/transfer_functions/tests/test__init__.py
index 9243bf3a37..41d5459888 100644
--- a/colour/models/rgb/transfer_functions/tests/test__init__.py
+++ b/colour/models/rgb/transfer_functions/tests/test__init__.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.common` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_aces.py b/colour/models/rgb/transfer_functions/tests/test_aces.py
index e40647d8b9..4ac1ce8d70 100644
--- a/colour/models/rgb/transfer_functions/tests/test_aces.py
+++ b/colour/models/rgb/transfer_functions/tests/test_aces.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.aces`
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.aces`
 module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_arib_std_b67.py b/colour/models/rgb/transfer_functions/tests/test_arib_std_b67.py
index 69af7c5fde..3bafc41fd4 100644
--- a/colour/models/rgb/transfer_functions/tests/test_arib_std_b67.py
+++ b/colour/models/rgb/transfer_functions/tests/test_arib_std_b67.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.arib_std_b67` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_arri_alexa_log_c.py b/colour/models/rgb/transfer_functions/tests/test_arri_alexa_log_c.py
index aa5b86fa09..86db79e695 100644
--- a/colour/models/rgb/transfer_functions/tests/test_arri_alexa_log_c.py
+++ b/colour/models/rgb/transfer_functions/tests/test_arri_alexa_log_c.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.arri_alexa_log_c` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_blackmagic_design.py b/colour/models/rgb/transfer_functions/tests/test_blackmagic_design.py
index 78a6bd3095..959824f471 100644
--- a/colour/models/rgb/transfer_functions/tests/test_blackmagic_design.py
+++ b/colour/models/rgb/transfer_functions/tests/test_blackmagic_design.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 blackmagic_design` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_canon_log.py b/colour/models/rgb/transfer_functions/tests/test_canon_log.py
index aa928e11ba..5f61e42bdf 100644
--- a/colour/models/rgb/transfer_functions/tests/test_canon_log.py
+++ b/colour/models/rgb/transfer_functions/tests/test_canon_log.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.canon_log` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_cineon.py b/colour/models/rgb/transfer_functions/tests/test_cineon.py
index a8920b8e54..398fd8573e 100644
--- a/colour/models/rgb/transfer_functions/tests/test_cineon.py
+++ b/colour/models/rgb/transfer_functions/tests/test_cineon.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.cineon` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_common.py b/colour/models/rgb/transfer_functions/tests/test_common.py
index 1fc07d6951..07bc872ba3 100644
--- a/colour/models/rgb/transfer_functions/tests/test_common.py
+++ b/colour/models/rgb/transfer_functions/tests/test_common.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.common` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_davinci_intermediate.py b/colour/models/rgb/transfer_functions/tests/test_davinci_intermediate.py
index 26814a2a18..f33c90d26e 100644
--- a/colour/models/rgb/transfer_functions/tests/test_davinci_intermediate.py
+++ b/colour/models/rgb/transfer_functions/tests/test_davinci_intermediate.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 davinci_intermediate` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_dcdm.py b/colour/models/rgb/transfer_functions/tests/test_dcdm.py
index 3ff42bdaff..8d745a110c 100644
--- a/colour/models/rgb/transfer_functions/tests/test_dcdm.py
+++ b/colour/models/rgb/transfer_functions/tests/test_dcdm.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.dcdm`
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.dcdm`
 module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_dicom_gsdf.py b/colour/models/rgb/transfer_functions/tests/test_dicom_gsdf.py
index 23051a0256..7a23588f4b 100644
--- a/colour/models/rgb/transfer_functions/tests/test_dicom_gsdf.py
+++ b/colour/models/rgb/transfer_functions/tests/test_dicom_gsdf.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.dicom_gsdf` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_dji_dlog.py b/colour/models/rgb/transfer_functions/tests/test_dji_dlog.py
index 65da83cf13..ae5e32d754 100644
--- a/colour/models/rgb/transfer_functions/tests/test_dji_dlog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_dji_dlog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 dji_dlog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_exponent.py b/colour/models/rgb/transfer_functions/tests/test_exponent.py
index cca8b36402..cba498ced7 100644
--- a/colour/models/rgb/transfer_functions/tests/test_exponent.py
+++ b/colour/models/rgb/transfer_functions/tests/test_exponent.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.exponent` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_filmic_pro.py b/colour/models/rgb/transfer_functions/tests/test_filmic_pro.py
index 92c765b6d1..ef009054d5 100644
--- a/colour/models/rgb/transfer_functions/tests/test_filmic_pro.py
+++ b/colour/models/rgb/transfer_functions/tests/test_filmic_pro.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.filmic_pro` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_filmlight_tlog.py b/colour/models/rgb/transfer_functions/tests/test_filmlight_tlog.py
index e9875a6965..5a75b0b58b 100644
--- a/colour/models/rgb/transfer_functions/tests/test_filmlight_tlog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_filmlight_tlog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 filmlight_tlog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_fujifilm_flog.py b/colour/models/rgb/transfer_functions/tests/test_fujifilm_flog.py
index 094c7cb3d7..1ecd2fac6f 100644
--- a/colour/models/rgb/transfer_functions/tests/test_fujifilm_flog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_fujifilm_flog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 fujifilm_flog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_gamma.py b/colour/models/rgb/transfer_functions/tests/test_gamma.py
index e7c0ec1011..d142768b00 100644
--- a/colour/models/rgb/transfer_functions/tests/test_gamma.py
+++ b/colour/models/rgb/transfer_functions/tests/test_gamma.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.gamma` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_gopro.py b/colour/models/rgb/transfer_functions/tests/test_gopro.py
index 0dd5c8f925..2b8645bc4a 100644
--- a/colour/models/rgb/transfer_functions/tests/test_gopro.py
+++ b/colour/models/rgb/transfer_functions/tests/test_gopro.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.gopro` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_itur_bt_1886.py b/colour/models/rgb/transfer_functions/tests/test_itur_bt_1886.py
index 542118877e..4b8417314b 100644
--- a/colour/models/rgb/transfer_functions/tests/test_itur_bt_1886.py
+++ b/colour/models/rgb/transfer_functions/tests/test_itur_bt_1886.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.itur_bt_1886` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_itur_bt_2020.py b/colour/models/rgb/transfer_functions/tests/test_itur_bt_2020.py
index f292e98a5c..12acc04e3b 100644
--- a/colour/models/rgb/transfer_functions/tests/test_itur_bt_2020.py
+++ b/colour/models/rgb/transfer_functions/tests/test_itur_bt_2020.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.itur_bt_2020` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_itur_bt_2100.py b/colour/models/rgb/transfer_functions/tests/test_itur_bt_2100.py
index ecdf6841e0..dc40ba3ee6 100644
--- a/colour/models/rgb/transfer_functions/tests/test_itur_bt_2100.py
+++ b/colour/models/rgb/transfer_functions/tests/test_itur_bt_2100.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.itur_bt_2100` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_itur_bt_601.py b/colour/models/rgb/transfer_functions/tests/test_itur_bt_601.py
index d9a071a22a..14cecde576 100644
--- a/colour/models/rgb/transfer_functions/tests/test_itur_bt_601.py
+++ b/colour/models/rgb/transfer_functions/tests/test_itur_bt_601.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.itur_bt_601` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_itur_bt_709.py b/colour/models/rgb/transfer_functions/tests/test_itur_bt_709.py
index c34d4ea0f1..77f3874b58 100644
--- a/colour/models/rgb/transfer_functions/tests/test_itur_bt_709.py
+++ b/colour/models/rgb/transfer_functions/tests/test_itur_bt_709.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.itur_bt_709` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_linear.py b/colour/models/rgb/transfer_functions/tests/test_linear.py
index 7cb839997f..7309e2741b 100644
--- a/colour/models/rgb/transfer_functions/tests/test_linear.py
+++ b/colour/models/rgb/transfer_functions/tests/test_linear.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.linear` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_log.py b/colour/models/rgb/transfer_functions/tests/test_log.py
index 6e1b1e7e3a..34d6374883 100644
--- a/colour/models/rgb/transfer_functions/tests/test_log.py
+++ b/colour/models/rgb/transfer_functions/tests/test_log.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.log` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_nikon_nlog.py b/colour/models/rgb/transfer_functions/tests/test_nikon_nlog.py
index 5bb913d749..7f6999a077 100644
--- a/colour/models/rgb/transfer_functions/tests/test_nikon_nlog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_nikon_nlog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 nikon_nlog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_panalog.py b/colour/models/rgb/transfer_functions/tests/test_panalog.py
index ea876702cf..4554b1b2cb 100644
--- a/colour/models/rgb/transfer_functions/tests/test_panalog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_panalog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.panalog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_panasonic_vlog.py b/colour/models/rgb/transfer_functions/tests/test_panasonic_vlog.py
index 5f9a5e477f..af2a69a0f7 100644
--- a/colour/models/rgb/transfer_functions/tests/test_panasonic_vlog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_panasonic_vlog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 panasonic_vlog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_pivoted_log.py b/colour/models/rgb/transfer_functions/tests/test_pivoted_log.py
index b135443b0d..a33395f219 100644
--- a/colour/models/rgb/transfer_functions/tests/test_pivoted_log.py
+++ b/colour/models/rgb/transfer_functions/tests/test_pivoted_log.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.\
 pivoted_log` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_red_log.py b/colour/models/rgb/transfer_functions/tests/test_red_log.py
index 714395e9f1..5353d6e13c 100644
--- a/colour/models/rgb/transfer_functions/tests/test_red_log.py
+++ b/colour/models/rgb/transfer_functions/tests/test_red_log.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.red_log` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_rimm_romm_rgb.py b/colour/models/rgb/transfer_functions/tests/test_rimm_romm_rgb.py
index 63962e4a0b..e062c559ea 100644
--- a/colour/models/rgb/transfer_functions/tests/test_rimm_romm_rgb.py
+++ b/colour/models/rgb/transfer_functions/tests/test_rimm_romm_rgb.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.rimm_romm_rgb` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_smpte_240m.py b/colour/models/rgb/transfer_functions/tests/test_smpte_240m.py
index ba60c4188e..5c51063c1c 100644
--- a/colour/models/rgb/transfer_functions/tests/test_smpte_240m.py
+++ b/colour/models/rgb/transfer_functions/tests/test_smpte_240m.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.smpte_240m` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_sony_slog.py b/colour/models/rgb/transfer_functions/tests/test_sony_slog.py
index 1806879158..49f16ac816 100644
--- a/colour/models/rgb/transfer_functions/tests/test_sony_slog.py
+++ b/colour/models/rgb/transfer_functions/tests/test_sony_slog.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.sony_slog` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_srgb.py b/colour/models/rgb/transfer_functions/tests/test_srgb.py
index 55b1498dda..d340da7763 100644
--- a/colour/models/rgb/transfer_functions/tests/test_srgb.py
+++ b/colour/models/rgb/transfer_functions/tests/test_srgb.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.models.rgb.transfer_functions.sRGB`
+Define the unit tests for the :mod:`colour.models.rgb.transfer_functions.sRGB`
 module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_st_2084.py b/colour/models/rgb/transfer_functions/tests/test_st_2084.py
index 04fb2e757a..3aeb675198 100644
--- a/colour/models/rgb/transfer_functions/tests/test_st_2084.py
+++ b/colour/models/rgb/transfer_functions/tests/test_st_2084.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.st_2084` module.
 """
 
diff --git a/colour/models/rgb/transfer_functions/tests/test_viper_log.py b/colour/models/rgb/transfer_functions/tests/test_viper_log.py
index a4f557a5ce..23ef703f81 100644
--- a/colour/models/rgb/transfer_functions/tests/test_viper_log.py
+++ b/colour/models/rgb/transfer_functions/tests/test_viper_log.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the
+Define the unit tests for the
 :mod:`colour.models.rgb.transfer_functions.viper_log` module.
 """
 
diff --git a/colour/notation/datasets/munsell/__init__.py b/colour/notation/datasets/munsell/__init__.py
index 2195aafc36..7b6d5b9ffd 100644
--- a/colour/notation/datasets/munsell/__init__.py
+++ b/colour/notation/datasets/munsell/__init__.py
@@ -21,7 +21,7 @@
     }
 )
 MUNSELL_COLOURS.__doc__ = """
-Defines the *Munsell Renotation System* datasets.
+Define the *Munsell Renotation System* datasets.
 
 -   ``Munsell Colours All``: *all* published *Munsell* colours, including the
     extrapolated colors.
diff --git a/colour/notation/munsell.py b/colour/notation/munsell.py
index c092e49383..9d182f52c9 100644
--- a/colour/notation/munsell.py
+++ b/colour/notation/munsell.py
@@ -262,17 +262,17 @@
     "CIE 1931 2 Degree Standard Observer"
 ][ILLUMINANT_NAME_MUNSELL]
 
-_MUNSELL_SPECIFICATIONS_CACHE: Dict = CACHE_REGISTRY.register_cache(
-    f"{__name__}._MUNSELL_SPECIFICATIONS_CACHE"
+_CACHE_MUNSELL_SPECIFICATIONS: Dict = CACHE_REGISTRY.register_cache(
+    f"{__name__}._CACHE_MUNSELL_SPECIFICATIONS"
 )
-_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE: Dict = (
+_CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR: Dict = (
     CACHE_REGISTRY.register_cache(
-        f"{__name__}._MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE"
+        f"{__name__}._CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR"
     )
 )
-_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE: Dict = (
+_CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION: Dict = (
     CACHE_REGISTRY.register_cache(
-        f"{__name__}._MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE"
+        f"{__name__}._CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION"
     )
 )
 
@@ -304,10 +304,10 @@ def _munsell_specifications() -> NDArray:
         *Munsell Renotation System* specifications.
     """
 
-    global _MUNSELL_SPECIFICATIONS_CACHE
+    global _CACHE_MUNSELL_SPECIFICATIONS
 
-    if "All" in _MUNSELL_SPECIFICATIONS_CACHE:
-        return _MUNSELL_SPECIFICATIONS_CACHE["All"]
+    if "All" in _CACHE_MUNSELL_SPECIFICATIONS:
+        return _CACHE_MUNSELL_SPECIFICATIONS["All"]
 
     munsell_specifications = np.array(
         [
@@ -318,7 +318,7 @@ def _munsell_specifications() -> NDArray:
         ]
     )
 
-    _MUNSELL_SPECIFICATIONS_CACHE["All"] = munsell_specifications
+    _CACHE_MUNSELL_SPECIFICATIONS["All"] = munsell_specifications
 
     return munsell_specifications
 
@@ -334,12 +334,12 @@ def _munsell_value_ASTMD1535_interpolator() -> Extrapolator:
         *Munsell* value interpolator for *ASTM D1535-08e1* method.
     """
 
-    global _MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE
+    global _CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR
 
     if "ASTM D1535-08 Interpolator" in (
-        _MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE
+        _CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR
     ):
-        return _MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE[
+        return _CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR[
             "ASTM D1535-08 Interpolator"
         ]
 
@@ -349,7 +349,7 @@ def _munsell_value_ASTMD1535_interpolator() -> Extrapolator:
     )
     extrapolator = Extrapolator(interpolator)
 
-    _MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR_CACHE[
+    _CACHE_MUNSELL_VALUE_ASTM_D1535_08_INTERPOLATOR[
         "ASTM D1535-08 Interpolator"
     ] = extrapolator
 
@@ -369,12 +369,12 @@ def _munsell_maximum_chromas_from_renotation() -> Tuple[
         Maximum *Munsell* chromas.
     """
 
-    global _MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE
+    global _CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION
 
     if "Maximum Chromas From Renotation" in (
-        _MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE
+        _CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION
     ):
-        return _MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE[
+        return _CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION[
             "Maximum Chromas From Renotation"
         ]
 
@@ -395,7 +395,7 @@ def _munsell_maximum_chromas_from_renotation() -> Tuple[
         zip(chromas.keys(), chromas.values())
     )
 
-    _MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION_CACHE[
+    _CACHE_MUNSELL_MAXIMUM_CHROMAS_FROM_RENOTATION[
         "Maximum Chromas From Renotation"
     ] = maximum_chromas_from_renotation
 
diff --git a/colour/quality/tests/test_cfi2017.py b/colour/quality/tests/test_cfi2017.py
index 5181c115f4..efd9aaa787 100644
--- a/colour/quality/tests/test_cfi2017.py
+++ b/colour/quality/tests/test_cfi2017.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.quality.CIE2017` module.
+Define the unit tests for the :mod:`colour.quality.CIE2017` module.
 
 Notes
 -----
diff --git a/colour/quality/tests/test_tm3018.py b/colour/quality/tests/test_tm3018.py
index b836019f11..80ab40d48f 100644
--- a/colour/quality/tests/test_tm3018.py
+++ b/colour/quality/tests/test_tm3018.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.quality.tm3018` module.
+Define the unit tests for the :mod:`colour.quality.tm3018` module.
 
 Notes
 -----
diff --git a/colour/recovery/smits1999.py b/colour/recovery/smits1999.py
index ac45ea17b2..32751850ee 100644
--- a/colour/recovery/smits1999.py
+++ b/colour/recovery/smits1999.py
@@ -147,41 +147,41 @@ def RGB_to_sd_Smits1999(RGB: ArrayLike) -> SpectralDistribution:
     array([ 0.1894770...,  0.1126470...,  0.0474420...])
     """
 
-    white_sd = SDS_SMITS1999["white"].copy()
-    cyan_sd = SDS_SMITS1999["cyan"].copy()
-    magenta_sd = SDS_SMITS1999["magenta"].copy()
-    yellow_sd = SDS_SMITS1999["yellow"].copy()
-    red_sd = SDS_SMITS1999["red"].copy()
-    green_sd = SDS_SMITS1999["green"].copy()
-    blue_sd = SDS_SMITS1999["blue"].copy()
+    sd_white = SDS_SMITS1999["white"].copy()
+    sd_cyan = SDS_SMITS1999["cyan"].copy()
+    sd_magenta = SDS_SMITS1999["magenta"].copy()
+    sd_yellow = SDS_SMITS1999["yellow"].copy()
+    sd_red = SDS_SMITS1999["red"].copy()
+    sd_green = SDS_SMITS1999["green"].copy()
+    sd_blue = SDS_SMITS1999["blue"].copy()
 
     R, G, B = to_domain_1(RGB)
-    sd = white_sd.copy() * 0
+    sd = sd_white.copy() * 0
     sd.name = f"Smits (1999) - {RGB!r}"
 
     if R <= G and R <= B:
-        sd += white_sd * R
+        sd += sd_white * R
         if G <= B:
-            sd += cyan_sd * (G - R)
-            sd += blue_sd * (B - G)
+            sd += sd_cyan * (G - R)
+            sd += sd_blue * (B - G)
         else:
-            sd += cyan_sd * (B - R)
-            sd += green_sd * (G - B)
+            sd += sd_cyan * (B - R)
+            sd += sd_green * (G - B)
     elif G <= R and G <= B:
-        sd += white_sd * G
+        sd += sd_white * G
         if R <= B:
-            sd += magenta_sd * (R - G)
-            sd += blue_sd * (B - R)
+            sd += sd_magenta * (R - G)
+            sd += sd_blue * (B - R)
         else:
-            sd += magenta_sd * (B - G)
-            sd += red_sd * (R - B)
+            sd += sd_magenta * (B - G)
+            sd += sd_red * (R - B)
     else:
-        sd += white_sd * B
+        sd += sd_white * B
         if R <= G:
-            sd += yellow_sd * (R - B)
-            sd += green_sd * (G - R)
+            sd += sd_yellow * (R - B)
+            sd += sd_green * (G - R)
         else:
-            sd += yellow_sd * (G - B)
-            sd += red_sd * (R - G)
+            sd += sd_yellow * (G - B)
+            sd += sd_red * (R - G)
 
     return sd
diff --git a/colour/utilities/__init__.py b/colour/utilities/__init__.py
index 22a0082902..6dcefd2e52 100644
--- a/colour/utilities/__init__.py
+++ b/colour/utilities/__init__.py
@@ -287,7 +287,7 @@ def __getattr__(self, attribute) -> Any:
     ],
 }
 """
-Defines the *colour.utilities* sub-package API changes.
+Define the *colour.utilities* sub-package API changes.
 
 API_CHANGES
 """
diff --git a/colour/volume/tests/test_rgb.py b/colour/volume/tests/test_rgb.py
index c19173abef..d157f9444d 100644
--- a/colour/volume/tests/test_rgb.py
+++ b/colour/volume/tests/test_rgb.py
@@ -1,5 +1,5 @@
 """
-Defines the unit tests for the :mod:`colour.volume.rgb` module.
+Define the unit tests for the :mod:`colour.volume.rgb` module.
 
 Notes
 -----