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English definition of “thirties”

thirties

noun [plural] uk   /ˈθɜː.tiz/ us    /ˈθɝː.t̬iz/
B2 A person's thirties are the period in which they are aged between 30 and 39: My brother is in his thirties. the thirties the range of temperature between 30° and 39°: The temperature is expected to be in the thirties tomorrow. B2 the decade (= period of ten years) between 30 and 39 in any century, usually 1930–1939: My family fled Germany in the thirties.
(Definition of thirties from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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