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reduction (n.)

early 15c., reduccioun, "a restoring to a former state" (a sense now obsolete), also "a conquest or subjugation" (of a people, etc.), from Old French reducion (13c., Modern French réduction) and directly from Latin reductionem (nominative reductio) "a leading back, restoration," noun of action from past-participle stem of reducere (see reduce). The meaning "diminution, a lessening" is from 1670s; chemical sense of "reversion to a simpler form" is from 1660s.

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Definitions of reduction from WordNet

reduction (n.)
the act of decreasing or reducing something;
Synonyms: decrease / diminution / step-down
reduction (n.)
any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent;
Synonyms: reducing
reduction (n.)
the act of reducing complexity;
Synonyms: simplification
From wordnet.princeton.edu