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



    BrE BrE//əˌprɒksɪˈmeɪʃn//
    ; NAmE NAmE//əˌprɑːksɪˈmeɪʃn//
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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. This is the nearest approximation of cost that they can give us. We do not have the true figures so we will have to make some approximations.
  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 American Dictionary entry: approximation