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English definition of “good night”

good night

exclamation    
A1 said when people leave each other in the evening or before going to bed or to sleep: Well, good night - sleep well. Give the children a good-night kiss. → Compare night exclamationWelcoming, greeting and greetings
(Definition of good night exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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