From Anglo-Norman memorie, Old French memoire etc., from Latin memoria ("the faculty of remembering, remembrance, memory, a historical account"), from memor, from Proto-Indo-European *(s)mer- (to remember), related to Ancient Greek μνήμη ("memory") μέρμερος, μέριμνα, Old English mimor ("mindful, remembering"). More at mimmer. memoir, and memoria.
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