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1. (n) (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber)
2. (n) the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling"
3. (n) a word formed from two or more words by omitting or combining some sounds; "won''t" is a contraction of "will not" "o''clock" is a contraction of "of the clock"
4. (n) the act of decreasing (something) in size or volume or quantity or scope
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