Definition for thirty - Oxford Dictionaries Online (World English)

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	thirty (thirty) Pronunciation: /ˈθəːti/ cardinal number (plural thirties) the number equivalent to the product of three and ten; ten less than forty; 30: thirty or forty years ago thirty were hurt thirty of her school friends (Roman numeral: xxx or XXX) (thirties) the numbers from thirty to thirty-nine, especially the years of a century or of a person’s life: a woman in her thirties she was a famous actress in the thirties thirty years old: I’ve got a long way to go before I’m thirty thirty miles an hour: doing about thirty a size of garment or other merchandise denoted by thirty. Derivatives thirtieth ordinal number thirtyfold adjective & adverb Origin: Old English thrītig (see three, -ty²). The spelling with initial thi- is recorded in literature in the 15th century, and has been the prevalent form since the 16th century		Search results in the dictionary thirty-eight thirty-something forty-something, etc. in something thirty-two-mo thirty-second note thirty-year rule Thirty Years War More results » Nearby Words third-level third-rate thirdly thirst thirstland thirsty thirteen Thirteen Colonies thirteenth cheque thirty Thirty Years War thirty-eight Thirty-nine Articles thirty-second note thirty-two-mo thirty-year rule Thiruvananthapuram this this-worldly