What does the word memoir mean?

Usage examples for memoir

  1. This investigation was first undertaken by the great astronomer Bessel, in his memoir on the appearance of Halley's comet in 1835, and it has since been considerably developed by Roche and the Russian astronomer Bredichin. – The Story of the Heavens by Robert Stawell Ball
  2. With notes and a memoir. – Oscar Wilde by Leonard Cresswell Ingleby