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English definition of “guesstimate”

guesstimate

noun [C] uk (also guestimate)   /ˈɡes.tə.mət/ informal us  
an approximate calculation of the size or amount of something when you do not know all the facts: Current guesstimates are that the company's turnover will increase by six percent this year.
(Definition of guesstimate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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