Entry 2 senses Webster, 1913 Ignition /ĭgnĭ'shən/ · Ig·ni·tion · IPA /ɪɡˈnɪʃən/ 01 n. The act of igniting, kindling, or setting on fire. 1. The act of igniting, kindling, or setting on fire. 2. The state of being ignited or kindled.