Entry 1 sense Webster, 1913 Immobility /ĭmˌ-ōb-ĭl'-ĭt-ē/ · Im·mo·bil·i·ty · IPA /ˌɪmoʊbˈɪlɪtiː/ 01 n. The condition or quality of being immobile; fixedness in place or state. 1. The condition or quality of being immobile; fixedness in place or state.