Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The cardinal number equal to 3 × 10.
  • noun A decade or the numbers from 30 to 39.
  • noun The decade from 30 to 39 in a century.
  • noun An indication of the end of a news story, usually written 30.
  • noun Sports The second point that is scored by one side in tennis.

from The Century Dictionary.

  • noun In printing and telegraphy, the last sheet, word, or line of copy or of a despatch.
  • Being thrice ten, three times ten, or twenty and ten.
  • noun The number which consists of three times ten.
  • noun A symbol representing thirty units, as 30, XXX, or xxx.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Being three times ten; consisting of one more than twenty-nine; twenty and ten.
  • noun The sum of three tens, or twenty and ten; thirty units or objects.
  • noun A symbol expressing thirty, as 30, or XXX.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.
  • noun slang A rack of thirty beers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the cardinal number that is the product of ten and three
  • adjective being ten more than twenty

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English thritty, thirty, from Old English thrītig; see trei- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old English þritiġ

Examples

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