Entry 1 sense Webster, 1913 Invincibility /ĭnˌ-vĭnˌ-səb-ĭl'-ĭt-ē/ · In·vin·ci·bil·i·ty · IPA /[ɪnˌvɪn.səˈbɪl.ə.ɾi]/ 01 n. The quality or state of being invincible; invincibleness. 1. The quality or state of being invincible; invincibleness.