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eightieth

[ ey-tee-ith ]
/ ˈeɪ ti ɪθ /
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adjective

next after the seventy-ninth; being the ordinal number for 80.
being one of 80 equal parts.

noun

an eightieth part, especially of one (1/80).
the eightieth member of a series.

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Origin of eightieth

1350–1400; Middle English eightetithe,Old English (hund)eahtatigotha eightieth. See eighty, -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for eightieth

eightieth
/ (ˈeɪtɪɪθ) /

adjective

(usually prenominal)
  1. being the ordinal number of eighty in numbering or counting order, position, time, etc: often written 80th
  2. (as noun)the eightieth in succession

noun

  1. one of 80 approximately equal parts of something
  2. (as modifier)an eightieth part
the fraction equal to one divided by 80 (1/80)
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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