Main entry: autumnal
Definition: of or characteristic of or occurring in autumn
Usage: the autumnal equinox; autumnal fruits
Antonyms: vernal
Definition: of or characteristic of or occurring in spring
Antonyms: summery
Definition: belonging to or characteristic of or occurring in summer
Definition: characteristic of or occurring in winter
Main entry: autumnal
Definition: characteristic of late maturity verging on decline
Usage: a serene autumnal mood
Antonyms: immature
Definition: not yet mature
Antonyms: immature
Definition: characteristic of a lack of maturity