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immemorial

Flag: gbEnglishOxford English Thesaurus
immemorial
adjective
an immemorial custom:
ancient, old, very old, age-old, antediluvian, timeless, dateless, archaic, long-standing, long-lived, time-worn, time-honoured;
ancestral, traditional, atavistic;
of yore, rooted in the past.
▷antonyms recent.
immemorial Oxford Dictionary of English