opposing speech; rebuttal
Used in formal debate or legal contexts for a speech that counters a previous argument.
He refuted the opponent's argument in his rebuttal speech.
The lawyer delivered a rebuttal in court.
反論 is a general term for objection or counterargument, while 反対弁論 specifically refers to a formal rebuttal speech in debate or legal settings.
Compound of 反対 (opposition) and 弁論 (speech, argument).