• synonyms


[ fawr-tee-ith ]
/ ˈfɔr ti ɪθ /


next after the thirty-ninth; being the ordinal number for 40.
being one of 40 equal parts.


a fortieth part, especially of one (1/40).
the fortieth member of a series.

Nearby words

forth, forthcoming, forthright, forthwith, forties, fortieth, fortification, fortification agate, fortified pa, fortified wine, fortify

Origin of fortieth

before 1100; Middle English fourtithe, Old English fēowertigotha. See forty, -eth2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fortieth

British Dictionary definitions for fortieth


/ (ˈfɔːtɪɪθ) /


  1. being the ordinal number of forty in numbering or counting order, position, time, etc. Often written: 40th
  2. (as noun)he was the fortieth


  1. one of 40 approximately equal parts of something
  2. (as modifier)a fortieth part
the fraction equal to one divided by 40 (1/40)

Word Origin for fortieth

Old English fēowertigotha
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 fortieth



Old English feowertigoða, from feowertig (see forty) + -th (1). Cf. Old Norse fertugonde, Swedish fyrationde, Danish fyrretyvende.

Online Etymology Dictionary, © 2010 Douglas Harper