Thirty meaning

thûr'tē
The cardinal number equal to 3 × 10.
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An indication of the end of a news story, usually written 30.
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The second point that is scored by one side in tennis.
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Three times ten.
adjective
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The cardinal number between twenty-nine and thirty-one; 30; XXX.
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This number used to signify the end of a dispatch, story, etc., as for a newspaper.
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(slang) A rack of thirty beers.
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the thirties
  • The numbers or years, as of a century, from thirty through thirty-nine.
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Idioms and Phrasal Verbs

the thirties

Origin of thirty

  • Middle English thritty, thirty from Old English thrītig trei- in Indo-European roots
    From American Heritage Dictionary of the English Language, 5th Edition
  • From Middle English thirty, metathetic alternant of Middle English thritti, þrittiȝ, from Old English þritiÄ¡ (“thirty"), from Proto-Germanic *þrÄ«z tigiwiz (“thrity", literally “three tens"), equivalent to three +"Ž -ty. Cognate with Scots therty, tretty (“thirty"), West Frisian tritich (“thrity"), Dutch dertig (“thrity"), German dreißig (“thirty").
    From Wiktionary