Entry 1 sense Webster, 1913 Regularity /(-l?r"?*t?)/ · Reg·u·lar·i·ty · IPA /ˌɹɛɡjuˈlæɹəti/ 01 n. The condition or quality of being regular; as, regularity of outline; the regularity of motion. 1. The condition or quality of being regular; as, regularity of outline; the regularity of motion.