• synonyms


  1. next after the seventy-ninth; being the ordinal number for 80.
  2. being one of 80 equal parts.
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  1. an eightieth part, especially of one (1/80).
  2. 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. 2018

Examples from the Web for eightieth

Historical Examples of eightieth

  • He was killed at the siege of Chatillon in his eightieth year.

    England, Picturesque and Descriptive

    Joel Cook

  • That is why you and I shall be giving it up forever on our eightieth birthday.

  • A small number only of mankind ever see their eightieth anniversary.

    Over the Teacups

    Oliver Wendell Holmes, Sr.

  • Even in his eightieth year he was occupied for the theatre in Venice.

    The Violoncello and Its History

    Wilhelm Joseph von Wasielewski

  • Solon, when he saw Sardis, was close upon his eightieth year.

British Dictionary definitions for eightieth


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