Definition of good afternoon exclamation from the Oxford Advanced Learner's Dictionary

 

good afternoon

 exclamation
exclamation
BrE BrE//ˌɡʊd ɑːftəˈnuːn//
 
; NAmE NAmE//ˌɡʊd æftərˈnuːn//
 
 
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used to say hello politely when people first see each other in the afternoon; in informal use people often just say Afternoon.
See the Oxford Advanced American Dictionary entry: good afternoon