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From Longman Dictionary of Contemporary English
Related topics: Numbers, Chronology
thirtythir‧ty /ˈθɜːti $ ˈθɜːrti/ ●●● S3 W3 number  1 HMNthe number 302 the thirties (also the '30s, the 1930s) [plural]TMCSH the years from 1930 to 1939 In the thirties, air travel really began to take off.the early/mid/late thirties The family sold the house in the early thirties.3 be in your thirties4 in the thirtiesthirtieth adjective, pronoun her thirtieth birthday