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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
900
before 900; thirty + -eth2; replacing Middle English thrittythe, Old English thrītegtha
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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