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[thur-tee-ith] /ˈθɜr ti ɪθ/
next after the twenty-ninth; being the ordinal number for 30.
being one of 30 equal parts.
a thirtieth part, especially of one (1/30).
the thirtieth member of a series.
Origin of thirtieth
before 900; thirty + -eth2; replacing Middle English thrittythe, Old English thrītegtha Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for thirtieth
Historical Examples
  • Richard, to reach his thirtieth year, had traveled far by many a twisting road.

    The President Alfred Henry Lewis
  • The blue diamond was sold at the Hôtel Drouot on the thirtieth of January.

    The Blonde Lady Maurice Leblanc
  • For it is in 1461, in his thirtieth year, that Villon last writes down a verse.

    Avril H. Belloc
  • Know you what walked around your tent on that thirtieth night of your camp out?

    Woodland Tales Ernest Seton-Thompson
  • Yes; poor child—nothing but a child—and yet in his thirtieth year!

    The Sand-Hills of Jutland Hans Christian Andersen
  • Though he was not aware of it, this was the thirtieth time he had read it since breakfast that morning.

    A Bid for Fortune Guy Boothby
  • One day succeeded another until at length the morning of the thirtieth of June dawned.

    Frank's Campaign Horatio Alger, Jr.
  • She was one of those blondes who fade rapidly after their thirtieth year.

    Fruitfulness Emile Zola
  • Myra had now completed, or was on the point of completing, her thirtieth year.

    Endymion Benjamin Disraeli
  • And now if ye will do battle, come again on the thirtieth day from hence.

    Cyropaedia Xenophon
British Dictionary definitions for thirtieth


(usually prenominal)
  1. being the ordinal number of thirty in counting order, position, time, etc: often written 30th
  2. (as noun): the thirtieth of the month
  1. one of 30 approximately equal parts of something
  2. (as modifier): a thirtieth part
the fraction equal to one divided by 30 (1/30)
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 thirtieth

Middle English threttyth, from Old English þritigoða; see thirty + -th (1). Respelled 16c. to conform to new spelling of thirty.

Online Etymology Dictionary, © 2010 Douglas Harper
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