Etymology
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decrease (v.)

early 15c., decresen (intransitive) "become less, be diminished gradually," from Anglo-French decreiss-, present-participle stem of decreistre, Old French descroistre (12c., Modern French décroître), from Latin decrescere "to grow less, diminish," from de "away from" (see de-) + crescere "to grow" (from PIE root *ker- (2) "to grow"). Transitive sense of "make less, lessen" is from late 15c. Related: Decreased; decreasing.

decrease (n.)

late 14c., "detriment, harm;" early 15c. as "a becoming less or smaller," from Anglo-French decres, from the verb (see decrease (v.)).

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Definitions of decrease
1
decrease (n.)
a change downward;
there was a decrease in his temperature as the fever subsided
Synonyms: lessening / drop-off
decrease (n.)
a process of becoming smaller or shorter;
Synonyms: decrement
decrease (n.)
the amount by which something decreases;
Synonyms: decrement
decrease (n.)
the act of decreasing or reducing something;
Synonyms: diminution / reduction / step-down
2
decrease (v.)
decrease in size, extent, or range;
The amount of homework decreased towards the end of the semester
Synonyms: diminish / lessen / fall
decrease (v.)
make smaller;
He decreased his staff
Synonyms: lessen / minify
From wordnet.princeton.edu