- (sometimes capital)
Also called (esp US): fallthe season of the year between summer and winter, astronomically from the September equinox to the December solstice in the N hemisphere and from the March equinox to the June solstice in the S hemisphere (as modifier): autumn leaves a period of late maturity, esp one followed by a decline
WordReference Random House Learner's Dictionary of American English © 2025
au•tumn /ˈɔtəm/USA pronunciation
n.
WordReference Random House Unabridged Dictionary of American English © 2025- the season between summer and winter; fall: [uncountable]In autumn the leaves fall.[countable]Autumns are fairly mild in that region.
- a time of late maturity:[uncountable]the autumn of one's life.
au•tumn
(ô′təm),USA pronunciation n.
- the season between summer and winter;
fall. In the Northern Hemisphere it is from the September equinox to the December solstice;
in the Southern Hemisphere it is from the March equinox to the June solstice. - a time of full maturity, esp. the late stages of full maturity or, sometimes, the early stages of decline:to be in the autumn of one's life.
- Latin
- Middle French autompne
- Latin autumnus; replacing Middle English autumpne
- 1325–75
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