Definition of interjection noun from the Oxford Advanced Learner's Dictionary

 

interjection

 noun
noun
BrE BrE//ˌɪntəˈdʒekʃn//
 
; NAmE NAmE//ˌɪntərˈdʒekʃn//
 
(grammar) 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 related entries: Grammar Word Origin late Middle English: via Old French from Latin interjectio(n-), from the verb interjicere, from inter- ‘between’ + jacere ‘to throw’.
See the Oxford Advanced American Dictionary entry: interjection