rejoinder n[Anglo-French, from rejoindre rejoinder to make rejoinder, literally, to join again, meet, from Old French, from re- again + joindre to join]
: an answer to a reply
: the defendant's answer to the plaintiff's reply or replication under common-law pleading
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.