Civil Procedure in the U.S.
Federal Rules of Civil Procedure Doctrines of civil procedure Jurisdiction Subject-matter jurisdiction Diversity jurisdiction Personal jurisdiction Removal jurisdiction Venue Change of venue Forum non conveniens Pleadings and motions Service of process Complaint Cause of action Case Information Statement Class action Class Action Fairness Act of 2005 Demurrer Answer Affirmative defense Reply Counterclaim Cross-claim Joinder Impleader Interpleader Intervention Pre-trial procedure Discovery Interrogatories Depositions Resolution Without Trial Default judgment Summary judgment Voluntary dismissal Involuntary dismissal Settlement Trial Parties Plaintiff Defendant Jury Voir dire Burden of proof Judgment Judgment as a matter of law (JMOL) Renewed JMOL (JNOV) Motion to set aside judgment New trial Remedy Injunction Damages Attorney's fees American rule English rule Declaratory judgment Appeal Mandamus Certiorari
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Look up Reply in
Wiktionary, the free dictionary.

The reply is a response by plaintiff to defendant's answer. A reply occurs only when defendant has asserted a counterclaim or the court has ordered a reply.

It is important to keep in mind that "plaintiff" in this context may also refer to an impleaded party. So, if a defendant impleads a party, this new party is the third-party defendant and the original defendant is the third-party plaintiff. The third-party plaintiff must file a complaint on the third-party defendant, who then must answer. The court may order a reply to this third-party defendant's answer.