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English definition of “forties”

forties

noun [plural]     /ˈfɔː.tiz/ US  /ˈfɔːr.t̬iz/
B2 A person's forties are the period in which they are aged between 40 and 49: She's probably in her early forties.Describing age and birthdays the forties the range of temperature between 40° and 49°: The temperature is expected to be in the forties tomorrow .Measurements of temperature B2 the decade (= period of ten years ) between 40 and 49 in any century , usually 1940–1949: Our house was built some time in the forties.Decades, centuries and the millennium
(Definition of forties noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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