Definition of autumnal adjective from the Oxford Advanced Learner's Dictionary

 

autumnal

 adjective
adjective
BrE BrE//ɔːˈtʌmnəl//
 
; NAmE NAmE//ɔːˈtʌmnəl//
 
[usually before noun]
 
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like or connected with autumn autumnal colours Word Origin late 16th cent.: from Latin autumnalis, from autumnus ‘autumn’.
See the Oxford Advanced American Dictionary entry: autumnal