Defendant

The person defending or denying; the party against whom relief or recovery is sought in an action or suit, or the accused in a criminal case.

In every legal action, whether civil or criminal, there are two sides. The person suing is the plaintiff and the person against whom the suit is brought is the defendant. In some instances, there may be more than one plaintiff or defendant.

If an individual is being sued by his or her neighbor for Trespass, then he or she is the defendant in a civil suit. The person being accused of murder by the state in a Homicide case is the defendant in a criminal action.

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defendant n. 1) the party sued in a civil lawsuit or the party charged with a crime in a criminal prosecution. In some types of cases (such as divorce) a defendant may be called a respondent. (See: plaintiff)

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DEFENDANT. A party who is sued in a personal action. Vide Demandant; Parties to Actions; Pursuer; and Com. Dig. Abatement, F; Action upon the case upon assumpsit, E, b; Bouv. Inst. Index, h.t.
     2. At common law a defendant cannot have judgment to recover a sum of money of the plaintiff. But this rule is, in some cases, altered by the act of assembly in Pennsylvania, as by the. Act of 1705, for defalcation, by which he may sue out a sci. fac. on the record of a verdict for a sum found in his favor. 6 Binn. Rep. 175. See Account 6.