Autumn (noun)

1. The season of the year between summer and winter, usually from September to November in the Northern Hemisphere and from March to May in the Southern Hemisphere.
2. The time of year when leaves fall from trees.

Origin:

From the old french word "autompne" which was derived from the latin word "autumnus" which in turn was derived from the etruscan word "autu".

Examples:

1. Autumn is my favorite season of the year.
2. The autumn leaves were a beautiful shade of orange and yellow.
3. The autumn breeze was cool and refreshing.
4. Autumn is the time of year when the days start getting shorter.
5. The autumn equinox marks the start of the season.