The definition of autumn is the season of the year that comes between summer and winter.(noun)
An example of Autumn is the months of October and November.
See autumn in Webster's New World College Dictionary
Origin: ME autumpne < OFr autompne < L autumnus, auctumnus; prob. of Etr orig.
See autumn in American Heritage Dictionary 4
Origin: Middle English autumpne
Origin: , from Old French autompne
Origin: , from Latin autumnus.
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