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Definition of antediluvian:

  1. Of or relating to the period before the Deluge in Noah's time; hence, antiquated; as, an antediluvian vehicle.
  2. One who lived before the Deluge.


old, dateless, aging, new, hoary, age-old, antediluvial, out-of-date, old-time, immemorial, hoar, ageing, timeworn, archaic, early, antiquity, olden, start, antediluvian patriarch, antiquated, ancestor, old-fashioned.

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