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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.Guesses and assumptionsCalculations and calculatingAddition, subtraction, multiplication and division
(Definition of guesstimate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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