Definition from Wiktionary, the free dictionary
- ancient or antiquated; old; prehistoric.
- Supremely dated.
- Those ideas are antediluvian.
- Pertaining or belonging to the time period prior to a great or destructive flood or deluge
- (biblical) Pertaining or belonging to the time prior to Noah's Flood.
- For usage examples of this term, see the citations page.
Coordinate terms 
Extremely ancient or antiquated; old; prehistoric
Pertaining or belonging to the time period prior to a great or destructive flood or deluge
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Translations to be checked
antediluvian (plural antediluvians)
- One who lived prior to Noah's Flood.