Etymology
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diminution (n.)

c. 1300, diminucioun, "extenuation of sin;" late 14c. as "act of diminishing, lessening, or reducing; process of becoming less," from Anglo-French diminuciun, Old French diminucion and directly from Latin diminutionem (nominative diminutio), earlier deminutionem, noun of action from past-participle stem of deminuere "lessen, diminish," from de- "completely" (see de-) + minuere "make small" (from PIE root *mei- (2) "small"). Diminishment (1540s) is now obsolete or rare.

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Definitions of diminution

diminution (n.)
change toward something smaller or lower;
Synonyms: decline
diminution (n.)
the statement of a theme in notes of lesser duration (usually half the length of the original);
diminution (n.)
the act of decreasing or reducing something;
Synonyms: decrease / reduction / step-down
From wordnet.princeton.edu