Entry 1 sense Webster, 1913 Inaccessibility /ĭnˌ-ək-sĕsˌ-əb-ĭl'-ət-ē/ · In·ac·cess·i·bil·i·ty · IPA /ˌɪnəksˌɛsəbˈɪlətiː/ 01 n. The quality or state of being inaccessible; inaccessibleness. 1. The quality or state of being inaccessible; inaccessibleness.