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very old, old-fashioned, or out of date; antiquated; primitive: antediluvian ideas.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

1640–50; ante- + Latin dīluvi(um) a flood, deluge + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antediluvian (ˌæntɪdɪˈluːvɪən, -daɪ-)
1.  belonging to the ages before the biblical Flood (Genesis 7, 8)
2.  old-fashioned or antiquated
3.  an antediluvian person or thing
[C17: from ante- + Latin dīluvium flood]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  antediluvian1
Part of Speech:  adj
Definition:  before the Flood (in the Bible); pertaining to the time before the Flood
Etymology:  ante- + diluvium 'the deluge'
Main Entry:  antediluvian1
Part of Speech:  n
Definition:  a very old person
Etymology:  ante- + diluvium 'the deluge'
Main Entry:  antediluvian2
Part of Speech:  adj
Definition:  antiquated; from a much earlier time
Etymology:  ante- + diluvium 'the deluge'
Main Entry:  antediluvian2
Part of Speech:  n
Definition:  a person who lived before the Flood
Etymology:  ante- + diluvium 'the deluge''s 21st Century Lexicon
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Word Origin & History

"before Noah's flood," 1646, formed from L. ante- "before" (see ante) + diluvium "a flood" (see deluge). Coined by Eng. physician Sir Thomas Browne (1605-1682).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The antediluvian bug eyed monsters opposing this will retire soon enough.
It then scrapped its antediluvian operating system and developed an entirely
  new one that has won plaudits from reviewers.
Not that he clings to a shirt and tie as some antediluvian affect.
Their sick-leave levels are ludicrous, their overtime arrangements antediluvian.
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