Antonyms of noun contraction

1 of 4 senses of contraction

Sense 4
contraction -- (the act of decreasing (something) in size or volume or quantity or scope)
       Antonym of expansion (Sense 1)
      => expansion, enlargement -- (the act of increasing (something) in size or volume or quantity or scope)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun contraction

4 senses of contraction

Sense 1
contraction, muscular contraction, muscle contraction -- ((physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber))
       => shortening -- (act of decreasing in length; "the dress needs shortening")

Sense 2
compression, condensation, contraction -- (the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling")
       => shrinking, shrinkage -- (process or result of becoming less or smaller; "the material lost 2 inches per yard in shrinkage")

Sense 3
contraction -- (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'")
       => word -- (a unit of language that native speakers can identify; "words are the blocks from which sentences are made"; "he hardly said ten words all morning")

Sense 4
contraction -- (the act of decreasing (something) in size or volume or quantity or scope)
       => decrease, diminution, reduction, step-down -- (the act of decreasing or reducing something)