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n. 1) one of the participants in a lawsuit or other legal proceeding who has an interest in the outcome. Parties include plaintiff (person filing suit), defendant (person sued or charged with a crime), petitioner (files a petition asking for a court ruling), respondent (usually in opposition to a petition or an appeal), cross-complainant (a defendant who sues someone else in the same lawsuit), or cross-defendant (a person sued by a cross-complainant). 2) a person or entity involved in an agreement. 3) a common reference by lawyers to people or entities involved in lawsuits, transactions, contracts or accidents, as in "both parties knew what was expected," "he is a party to the contract," "he was not a party to the criminal conspiracy…."