Meaning of “autumn” - Learner’s Dictionary

autumn

noun [ C, U ] us uk /ˈɔːtəm/ also US fall
Extra Examples
a crisp autumn daythe yellow and red tints of autumnIt really feels like the start of autumn today.A lot of trees shed their leaves in the autumn.She starts school this autumn.

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 adjective us uk /ɔːˈtʌmnəl/

typical of autumn

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