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English definition of “approximation”

approximation

noun [C] uk   /əˌprɒk.sɪˈmeɪ.ʃən/ us    /-ˌprɑːk-/ formal
a guess of a number that is not exact but that is close: Could you give me a rough approximation of how many people will be coming? What he said bore no approximation whatsoever to the truth (= was not at all like the truth).
(Definition of approximation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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