American English

Definition of immemorial adjective from the Oxford Advanced American Dictionary

 

immemorial

 adjective
adjective
NAmE//ˌɪməˈmɔriəl//
 
(formal or literary)
 
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that has existed for longer than people can remember an immemorial tradition My family has lived in this area from time immemorial (= for hundreds of years).
See the Oxford Advanced Learner's Dictionary entry: immemorial