immemorial

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immemorial /ˌɪməˈmorijəl/ adjective
immemorial
/ˌɪməˈmorijəl/
adjective
Learner's definition of IMMEMORIAL
formal + literary
: very old or ancient : from a time so long ago that it cannot be remembered

— immemorially

/ˌɪməˈmorijəli/ adverb