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thirty

[thur-tee]
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noun, plural thir·ties.
  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. Printing, Journalism. 30-dash.
  5. thirties, 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.
adjective
  1. amounting to 30 in number.

Origin of thirty

before 900; Middle English thritty, Old English thrītig, equivalent to thrī three + -tig -ty1; cognate with Dutch dertig, German dreissig, Old Norse thrjātīu
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thirty

Contemporary Examples

Historical Examples

  • Some horrible accident might happen to delay us here thirty minutes.

    The Spenders

    Harry Leon Wilson

  • On the 14th, therefore, we started, carrying with us about thirty gallons of water.

  • To the east, plains for at least thirty miles, when broken ranges were visible.

  • They and their horses had been over thirty hours without water.

  • He was thirty years in my governor's service, and doesn't understand my ways.

    Viviette

    William J. Locke


British Dictionary definitions for thirty

thirty

noun plural -ties
  1. the cardinal number that is the product of ten and threeSee also number (def. 1)
  2. a numeral, 30, XXX, etc, representing this number
  3. (plural) the numbers 30–39, esp the 30th to the 39th year of a person's life or of a century
  4. the amount or quantity that is three times as big as ten
  5. something representing, represented by, or consisting of 30 units
determiner
    1. amounting to thirtythirty trees
    2. (as pronoun)thirty are broken

Word Origin

Old English thrītig; see three, -ty 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thirty

early 15c. metathesis of Old English þritig, from þri, þreo "three" + -tig "group of ten" (see -ty (1)). Cf. Old Frisian thritich, Old Saxon thritig, Dutch dertig, Old High German drizzug, German dreissig. Thirty Years' War (1842) was a religious power struggle waged 1618-48, mainly on German soil. The symbol -30- as printer and telegrapher's code to indicate the last sheet or line of copy or a dispatch is recorded from 1895. In 20c. jargon of journalism, it came to be a traditional sign-off signal and slang word for "the end."

Online Etymology Dictionary, © 2010 Douglas Harper

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