Respondent

The party who is required to answer a petition for a court order or writ requiring the respondent to take some action, halt an activity or obey a court's direction. In such matters the moving party (the one filing the petition) is usually called the "petitioner." Thus, the respondent is equivalent to a defendant in a lawsuit, but the potential result is a court order and not money damages.

Source: http://dictionary.law.com/Default.aspx?selected=1828