Definition of contraction
b : the shortening and thickening of a functioning muscle or muscle fiber
c : a reduction in business activity or growth
d : the act of acquiring or incurring (something, such as a debt) or catching (something, such as an infection) contraction of pneumonia
2 : a shortening of a word, syllable, or word group by omission of a sound or letter also : a form produced by such shortening "They'll" is a contraction for "they will."
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