[ ey-tee-ith ]

  1. next after the seventy-ninth; being the ordinal number for 80.

  2. being one of 80 equal parts.

  1. an eightieth part, especially of one (1/80).

  2. the eightieth member of a series.

Origin of eightieth

1350–1400; Middle English eightetithe,Old English (hund)eahtatigotha eightieth. See eighty, -th2

Words Nearby eightieth

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use eightieth in a sentence

  • He lived to be ninety years old, and produced the most beautiful of his tragedies in his eightieth year, the "Oedipus at Colonus."

  • Mlle. Clairon died on January 31, 1803, six days after completing her eightieth year.

    Queens of the French Stage | H. Noel Williams
  • So active did he continue to the end of his days, that on his eightieth birthday he climbed an oak in my company.

    Wanderings in South America | Charles Waterton
  • Since that date he has lived retired in Hutchinson, where he still makes his home, being now in the eightieth year of his age.

  • None of us are, you know, when we pass the eightieth milestone!

    Cursed | George Allan England

British Dictionary definitions for eightieth


/ (ˈeɪtɪɪθ) /

  1. (usually prenominal)

    • being the ordinal number of eighty in numbering or counting order, position, time, etc: often written 80th

    • (as noun): the eightieth in succession

    • one of 80 approximately equal parts of something

    • (as modifier): an eightieth part

  1. 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