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

 

rejoinder

 noun
noun
BrE BrE//rɪˈdʒɔɪndə(r)//
 
; NAmE NAmE//rɪˈdʒɔɪndər//
 
[usually singular](formal)
 
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a reply, especially a quick, critical or amusing one synonym retort ‘No!’ was his curt rejoinder. Word Origin late Middle English: from Anglo-Norman French rejoindre (infinitive used as a noun), from re- ‘again’ + joindre ‘to join’.
See the Oxford Advanced American Dictionary entry: rejoinder