meaning of autumn
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.
2. The harvest or fruits of autumn.
3. The time of maturity or decline; latter portion; third stage.