English

Definition of immemorial adjective from the Oxford Advanced Learner's Dictionary

 

immemorial

 adjective
adjective
BrE BrE//ˌɪməˈmɔːriəl//
 
; NAmE NAmE//ˌɪməˈmɔːriəl//
 
(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). Word Origin early 17th cent.: from medieval Latin immemorialis, from in- ‘not’ + memorialis ‘relating to the memory’.
See the Oxford Advanced American Dictionary entry: immemorial