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English definition of “-something”

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-something

suffix uk   /-sʌm.θɪŋ/ informal us  
used after a number like 20, 30, etc. to refer to the age of a person who is between 20 and 29, 30 and 39 years old, etc., or to a person who is of this age: I'd guess she's thirty-something. Most of these places are aimed at twenty-somethings.
(Definition of -something suffix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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