adj
immemorial
ih-muh-MAW-ree-uhl
adj
1
So old that it goes back further than anyone can remember or record.
"The village has followed the same harvest customs since time immemorial."
How to Use Immemorial
Learner’s notesIn plain EnglishExtremely old — from a time so far back no one can remember its start.
Common pairings
since time immemorial
immemorial custom
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The village has followed the same harvest customs since time _____.
Etymology
From French immemorial, formed from "im-" ("not") plus "memorial."