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[thur-tee] /ˈθɜr ti/
noun, plural thirties.
a cardinal number, 10 times 3.
a symbol for this number, as 30 or XXX.
a set of this many persons or things.
Printing, Journalism. 30-dash.
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.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for thirties
Contemporary Examples
Historical Examples
  • About forty, he was nearer the age of Doctor Davenport than the others, who were all in their earliest thirties.

    The Luminous Face Carolyn Wells
  • This was frontier when we came here in the thirties; we belong here.

    Winning the Wilderness Margaret Hill McCarter
  • But they mark the drift of Browning of the mid-'thirties, so far as they go, clearly enough.

    Robert Browning C. H. Herford
  • He might have been in the thirties or he might have been in the fifties.

    Simon J. Storer Clouston
  • During the thirties and forties the questions involving the Negroes engaged the attention of almost everybody.

    The History of the Negro Church Carter Godwin Woodson
British Dictionary definitions for thirties


noun (pl) -ties
the cardinal number that is the product of ten and three See also number (sense 1)
a numeral, 30, XXX, etc, representing this number
(pl) the numbers 30–39, esp the 30th to the 39th year of a person's life or of a century
the amount or quantity that is three times as big as ten
something representing, represented by, or consisting of 30 units
  1. amounting to thirty: thirty trees
  2. (as pronoun): thirty are broken
Word Origin
Old English thrītig; see three, -ty1
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
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Word Origin and History for thirties

1827 as the years of someone's life between 30 and 39; 1830 as a decade of years in a given century. See 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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Slang definitions & phrases for thirties

third sacker

noun phrase

A third baseman (1911+ Baseball)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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