Entry 2 senses Webster, 1913 Rioter /rī'-ət-ẽr/ · Ri·ot·er · IPA /ˈɹaɪətɚ/ 01 n. One who riots; a reveler; a roisterer. 1. One who riots; a reveler; a roisterer. 2. One who engages in a riot. See Riot, n., 3.(Law) See: Riot