memoir

Etymology

From French mémoire (“memoir”), from Latin memoria (“memory”). Doublet of memoria and memory.

noun

1. An autobiography; a book describing the personal experiences of an author.
   When I retire, I'm going to write my memoirs.
2. A biography; a book describing the experiences of a subject from personal knowledge of the subject or from sources with personal knowledge of the subject.
   James wrote a memoir of his grandmother shortly after she passed away.
3. Any form of narrative describing the personal experiences of a writer.