Etymology
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contraction (n.)

early 15c., contraccioun, "action of making a contract" (especially of marriage), a sense now obsolete; also "action of reducing, abridging, or shortening," from Old French contraction (13c.) or directly from Latin contractionem (nominative contractio) "a drawing together, an abridging, shortening, a shortening in pronunciation," noun of action from past-participle stem of contrahere "to draw several objects together; draw in, shorten, lessen, abridge," metaphorically "make a bargain, make an agreement," from assimilated form of com "with, together" (see con-) + trahere "to draw" (see tract (n.1)). Related: Contractional.

Meaning "action of becoming shorter or smaller through the drawing together of the parts" is from 1580s. Meaning "action of acquiring (a disease) is from 1680s. Grammatical sense of "a shortening of a word or syllable in pronunciation or writing" is from 1706; meaning "a contracted word or words" is from 1755. Contractions of the uterus in labor of childbirth attested from 1962.

Origin and meaning of contraction

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Definitions of contraction

contraction (n.)
(physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber);
Synonyms: muscular contraction / muscle contraction
contraction (n.)
the process or result of becoming smaller or pressed together;
the contraction of a gas on cooling
contraction (n.)
a word formed from two or more words by omitting or combining some sounds;
`o'clock' is a contraction of `of the clock'
`won't' is a contraction of `will not'
contraction (n.)
the act of decreasing (something) in size or volume or quantity or scope;
From wordnet.princeton.edu