re·join·der /ri-'jȯin-dər/ 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; specif: the defendant's answer to the plaintiff's reply or replication under common-law pleading
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.