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approximation

noun [C]
 
 
/əˌprɒk.sɪˈmeɪ.ʃən/ US  /-ˌprɑːk-/ formal

Definition

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).Guesses and assumptions
(Definition of approximation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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