American English

Definition of happening adjective from the Oxford Advanced American Dictionary

 

happening

 adjective
adjective
NAmE//ˈhæpənɪŋ//
 
, NAmE//ˈhæpnɪŋ//
 
[only before noun] (informal)
 
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where there is a lot of exciting activity; fashionable a happening place
See the Oxford Advanced Learner's Dictionary entry: happening