Entry 1 sense Webster, 1913 Vulnerability /vŭlˌ-nẽr-əb-ĭl'-ĭt-ē/ · Vul·ner·a·bil·i·ty · IPA /ˌvʌln(ə)ɹəˈbɪləti/ 01 n. The quality or state of being vulnerable; vulnerableness. 1. The quality or state of being vulnerable; vulnerableness.