IPA: /rɪˈdʒɔɪndər/
KK: /rɪˈdʒɔɪndər/
A response or reply, especially one given in a discussion or argument.
Her quick rejoinder caught everyone off guard during the debate.
Rejoinder is formed from "re-" (meaning again) and "joindre" (from Old French, meaning to join). The word refers to a response or reply that joins back to a previous statement or argument.
Think of 'joining back' ('re-') to a previous statement when you respond — that's what a rejoinder means.