Autumn Au"tumn, n. [L. auctumnus, autumnus, perh. fr. a root
av to satisfy one's self: cf. F. automne. See Avarice.]
1. The third season of the year, or the season between summer
and winter, often called ``the fall.'' Astronomically, it
begins in the northern temperate zone at the autumnal
equinox, about September 23, and ends at the winter
solstice, about December 23; but in popular language,
autumn, in America, comprises September, October, and
November.