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

 

upbeat

 adjective
adjective
BrE BrE//ˈʌpbiːt//
 
; NAmE NAmE//ˈʌpbiːt//
 
(informal) Describing music
 
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positive and enthusiastic; making you feel that the future will be good synonym optimistic The tone of the speech was upbeat. The meeting ended on an upbeat note. opposite downbeat See related entries: Describing music
See the Oxford Advanced American Dictionary entry: upbeat