nonparty adjective 2noun 1forms 1 adjective2 •Not a party (involved person or entity), or unrelated to a party. •Not a party (social gathering), or not related to parties or partying.Subsequent albums of nonparty songs and metal-like ballads have not been nearly as successful, but 20-something truth-seekers are not made for stasis. — 2007 noun1 •One who is not a party.Juries may not, however, use punitive damages to punish a defendant directly for harms that the defendant visited on nonparties. — 2007 formsnonparties