Definition of interjection noun from the Oxford Advanced American Dictionary

 

interjection

 noun
noun
NAmE//ˌɪntərˈdʒɛkʃn//
 
(grammar)
 
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a short sound, word, or phrase spoken suddenly to express an emotion. Oh!, Look out!, and Ow! are interjections. synonym exclamation
See the Oxford Advanced Learner's Dictionary entry: interjection