Definition of goodnight exclamation from the Oxford Advanced Learner's Dictionary

 

goodnight

 exclamation
exclamation
BrE BrE//ˌɡʊdˈnaɪt//
 
; NAmE NAmE//ˌɡʊdˈnaɪt//
 
 
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used when you are saying goodbye to somebody late in the evening, or when they or you are going to bed; in informal use people often just say Night.