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| thir·ty [ thúrtee ] |
noun (plural thir·ties) |
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1. 30: the number 30
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2. group of 30: a group of 30 objects or people
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3. score in tennis: in a game of tennis, the score awarded to a player with a score of 15 on winning a further point
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plural noun thir·ties |
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1. numbers 30 to 39: the numbers 30 to 39, particularly as a range of temperature
 in the low thirties
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2. years from 30 to 39: the years from 30 to 39 in a century
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3. period from age 30 to 39: the period of somebody's life from the age of 30 to 39
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| [ Old English þrītig< Germanic, "twice three"] |
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| thir·ty adjective, pron |
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