Main Entry: im·me·mo·ri·al

Pronunciation: \ˌi-mə-ˈmȯr-ē-əl\

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-lē\ adverb