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thirtieth

[thur-tee-ith] /ˈθɜr ti ɪθ/
adjective
1.
next after the twenty-ninth; being the ordinal number for 30.
2.
being one of 30 equal parts.
noun
3.
a thirtieth part, especially of one (1/30).
4.
the thirtieth member of a series.
Origin of thirtieth
900
before 900; thirty + -eth2; replacing Middle English thrittythe, Old English thrītegtha
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for thirtieth
Historical Examples
  • By the thirtieth time it has become a word like "snark" or "pobble."

    Alarms and Discursions G. K. Chesterton
  • She was one of those blondes who fade rapidly after their thirtieth year.

    Fruitfulness Emile Zola
  • And now if ye will do battle, come again on the thirtieth day from hence.

    Cyropaedia Xenophon
  • "In the thirtieth street station-house, sir," she briefly responded.

    The Masked Bridal Mrs. Georgie Sheldon
  • The Army of the Valley had its orders from Strasburg the night of the thirtieth.

    The Long Roll Mary Johnston
  • The delusion holding, he, at noon of the thirtieth, ordered a general advance.

    The Long Roll Mary Johnston
  • He had sons there himself, and a letter which he would read for the thirtieth time.

    The Long Roll Mary Johnston
  • She'll report for duty on the thirtieth, thank the powers which be.

    Peggy Stewart at School

    Gabrielle E. Jackson
  • At thirtieth Street he got off the car and walked west to Silver's place.

    From Place to Place

    Irvin S. Cobb
  • The paper-knife generally ceased to do duty before the thirtieth page.

    The Library Andrew Lang
British Dictionary definitions for thirtieth

thirtieth

/ˈθɜːtɪɪθ/
adjective
1.
(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
noun
2.
  1. one of 30 approximately equal parts of something
  2. (as modifier): a thirtieth part
3.
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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15
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