Definition of approximant noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//əˈprɒksɪmənt//
    ; NAmE NAmE//əˈprɑːksɪmənt//
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  1. 1 (phonetics) a speech sound made by bringing the parts of the mouth that produce speech close together but not actually touching, for example /r/ and /w/ in right and wet in many accents of English
  2. 2 (mathematics) an answer to a problem in mathematics that is a close estimate of the solution of the problem
See the Oxford Advanced American Dictionary entry: approximant