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contraction of the pupil

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WordReference Random House Learner's Dictionary of American English © 2015
con•trac•tion /kənˈtrækʃən/USA pronunciation n. 
  1. [countable] an act or instance of contracting:a contraction of about two inches in the cold weather.
  2. [uncountable] the quality or state of being contracted:the problem of contraction in the cold.
  3. Grammar[countable] a shortened form of a word or group of words, with the letters that were left out often replaced in written English by an apostrophe, such as isn't for is not, they're for they are, or e'er for ever.
  4. Communications, Business[uncountable] a decrease in economic and industrial activity(opposed to expansion):Another six months of contraction and we'll have a real recession on our hands.
See -trac-. Contractions (isn't, couldn't, can't, he'll ) occur chiefly, although not exclusively, in informal speech and writing. They are common in personal letters, business letters, journalism, and fiction;
rare in scientific and scholarly writing.See -trac-.

Collins Concise English Dictionary © HarperCollins Publishers::

contraction /kənˈtrækʃən/ n
  1. an instance of contracting or the state of being contracted
  2. any normal shortening or tensing of an organ or part, esp of a muscle, e.g. during childbirth
  3. any abnormal tightening or shrinking of an organ or part
  4. a shortening of a word or group of words, often marked in written English by an apostrophe: I've come for I have come

conˈtractive adj

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