The plaintiff's answer to a defendant's counterclaim is known as a counter-counterclaim.

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The plaintiff's answer to a defendant's counterclaim is known as a "reply" or "response," not a counter-counterclaim. Counterclaims are claims made by the defendant against the plaintiff in response to the original claim, and the plaintiff's subsequent response does not introduce a new claim but rather addresses the defendant's counterclaim.

The Plaintiff's Answer to a Defendant's Counterclaim Is Known as a Counter-Counterclaim