early 15c., "written record," from Anglo-French memorie "note, memorandum, something written to be kept in mind" (early 15c., Old French memoire), from Latin memoria (from PIE root *(s)mer- (1) "to remember"). Meaning "person's written account of his life" is from 1670s.
Biography, Memoir. When there is a difference between these words, it may be that memoir indicates a less complete or minute account of a person's life, or it may be that the person himself records his own recollections of the past, especially as connected with his own life; in the latter case memoir should be in the plural. [Century Dictionary]
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