Autumn, Fall

Yikes, tomorrow September 22 at exactly 9:54 P.M. EDT is the first day of Fall (as in fall of the leaf) in the Northern Hemisphere. Autumn is also the season that comes between summer and winter. Fall is the common American and Canadian term for Autumn. Before both of those terms, it was called Harvest.

Incidentally, September 1 is the beginning of Spring in Australia and New Zealand.