defendant -
Serving, or suitable, for defense; defensive.
Wikipedia
A defendant or defender is any party who is required to answer the complaint of a plaintiff or pursuer in a civil lawsuit before a court, or any party who has been formally charged or accused of violating a criminal statute. (Note that American lawyers and judges often pronounce the word slightly differently than is common in standard American English, pronouncing the final syllable exactly as one pronounces ant---the name of an insect---in this pronunciation scheme. ) A respondent is the parallel term used in a proceeding which is commenced by petition.
OmegaWiki Dictionary
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defendant Any party who is required to answer the complaint of a plaintiff in a civil lawsuit before a court.