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  1. next after the fifty-ninth; being the ordinal number for 60.
  2. being one of 60 equal parts.
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  1. a sixtieth part, especially of one (1/60).
  2. the sixtieth member of a series.
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Origin of sixtieth

before 1000; Middle English sixtithe, sixtiaghte, Old English sixtighetha, sixteoghotha; see sixty, -eth2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sixtieth


  1. (usually prenominal)
    1. being the ordinal number of sixty in numbering or counting order, position, time, etc: often written 60th
    2. (as noun)the sixtieth in a row
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    1. one of 60 approximately equal parts of something
    2. (as modifier)a sixtieth part
  1. the fraction equal to one divided by 60 (1/60)
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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 sixtieth

Old English sixteogoða "sixtieth;" see sixty + -th (1).

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Online Etymology Dictionary, © 2010 Douglas Harper