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Meaning of thirty

thir•ty

Pronunciation: (thûr'tē), [key]
— n., pl. adj. -ties,
—n.
  1. a cardinal number, 10 times 3.
  2. a symbol for this number, as 30 or XXX.
  3. a set of this many persons or things.
  4. 30-dash.
  5. the numbers, years, degrees, or the like, from 30 through 39, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature: He works in the East Thirties. She must be in her thirties. The temperature was in the thirties yesterday.
—adj.
  1. amounting to 30 in number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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