The season when leaves fall from trees; autumn. Season between
summer and winter. Astronomically it is the period from the
autumnal equinox to the winter solstice in the Northern
Hemisphere. the season when the leaves fall from the trees; "in
the fall of 1973" Autumn – the season between summer and winter
is called Fall throughout North America. Indiana University
divides the school year into two semesters—fall and spring. The
fall semester generally begins in late August or early September
and ends in mid-December. Fall also refers to one of the four
seasons (divisions of the year) experienced in Indiana. Fall,
also called autumn, is comprised of the transition months of
September, October, and November when the weather begins to cool
and winter approaches. autumn fanny (buttocks) bum [colloq.
Don't capitalize; for example, "fall semester," "fall 2001."