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English definition of “seventies”

seventies

noun [plural] uk   /ˈsev.ən.tiz/ us    /-t̬iz/
A person's seventies are the period in which they are aged between 70 and 79: He's very active considering he's in his seventies.the seventies the range of temperature between 70° and 79°: The temperature is expected to reach the seventies tomorrow. B2 the decade (= period of ten years) between 70 and 79 in any century, usually 1970–1979: Flared trousers and platform shoes were fashionable in the seventies.
(Definition of seventies from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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