1. (n.) 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.

2. (n.) The harvest or fruits of autumn.

3. (n.) The time of maturity or decline; latter portion; third stage.

aestival arctic autumnal boreal brumal canicular equinoctial fall harvest harvest home harvest time hibernal hiemal midsummer midwinter out of season seasonal solstitial spring springlike summer summerlike summerly summery vernal winter winterlike wintery wintry