Definitions from Wiktionary (antediluvian)

▸ adjective:  (biblical) Belonging or pertaining to, or existing in, the time prior to the great flood described in Genesis, or (by extension) to a great or destructive flood or deluge described in other mythologies.
▸ adjective:  (by extension) Of animals and plants: long extinct; prehistoric.
▸ adjective:  (figurative, hyperbolic, chiefly humorous)
▸ adjective:  Of a person or thing: very old; ancient.
▸ adjective:  Of attitudes, ideas, etc.: extremely old-fashioned, especially to a laughable extent; antiquated.
▸ noun:  (biblical) A person who lived in the time prior to the great flood described in Genesis, especially one of the biblical patriarchs.
▸ noun:  (figurative, hyperbolic, chiefly humorous)
▸ noun:  A very old person.
▸ noun:  A person with extremely old-fashioned attitudes, ideas, etc., especially to a laughable extent; a fogey or old fogey.
▸ Also see antediluvian



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