1
[ adjective ] so extremely old as seeming to belong to an earlier period

Examples

"a ramshackle antediluvian tenement" "antediluvian ideas" "archaic laws"

Related terms

old

2
[ adjective ] little evolved from or characteristic of an earlier ancestral type

Synonyms

primitive

Examples

"archaic forms of life" "primitive mammals" "the okapi is a short-necked primitive cousin of the giraffe"

Related terms

early

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