adj.
Pronunciation: ˌ i-m ə - ' mo ̇ r- ē - ə l
Function: adjective
Etymology: probably from French immémorial, from Middle French, from Medieval Latin immemorialis lacking memory, from Latin in- + memorialis memorial
Date: 1602
: extending or existing since beyond the reach of memory, record, or tradition <existing from time immemorial >
– im · me · mo · ri · al · ly \ - ē - ə -l ē \ adverb