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English definition of “nineties”

nineties

noun [plural] uk   /ˈnaɪn.tiz/ us    /-t̬iz/
B2 A person's nineties are the period in which they are aged between 90 and 99: She was well into her nineties when she died. the nineties the range of temperature between 90° and 99°: Today it's supposed to get very hot - maybe up into the nineties. B2 the decade (= period of ten years) between 90 and 99 in any century, usually 1990–1999: Bill Clinton was US president in/during the nineties.
(Definition of nineties from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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