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Definition of approximation noun from the Oxford Advanced American Dictionary

      

    approximation

     noun
    noun
    NAmE//əˌprɑksəˈmeɪʃn//
     
     
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  1. 1an estimate of a number or an amount that is almost correct, but not exact That's just an approximation, you understand. An approximation of the numbers expected to attend would be 350.
  2. 2approximation (of/to something) a thing that is similar to something else, but is not exactly the same Our results should be a good approximation of the true state of affairs.
See the Oxford Advanced Learner's Dictionary entry: approximation