[ an-tee-di-loo-vee-uhn ]
/ ˌæn ti dɪˈlu vi ən /


of or belonging to the period before the Flood. Genesis 7, 8.
very old, old-fashioned, or out of date; antiquated; primitive: antediluvian ideas.


a person who lived before the Flood.
a very old or old-fashioned person or thing.

Origin of antediluvian

First recorded in 1640–50; ante- + Latin dīluvi(um) “a flood, deluge” + -an;see origin at deluge Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for antediluvian

British Dictionary definitions for antediluvian

/ (ˌæntɪdɪˈluːvɪən, -daɪ-) /


belonging to the ages before the biblical Flood (Genesis 7, 8)
old-fashioned or antiquated


an antediluvian person or thing

Word Origin for antediluvian

C17: from ante- + Latin dīluvium flood
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