Meaning of “autumn” - Learner’s Dictionary

autumn

noun [ C, U ] uk us /ˈɔːtəm/ (also US fall)

A2 the season of the year between summer and winter, when leaves fall from the trees:

I'm starting a new job in the autumn.
autumn leaves
autumnal uk us /ɔːˈtʌmnəl/ adjective

typical of autumn

(Definition of “autumn” from the Cambridge Learner’s Dictionary © Cambridge University Press)