Entry 1 sense Webster, 1913 Infertility /ĭnˌ-fẽrt-ĭl'-ĭt-ēˌ/ · In·fer·til·i·ty · IPA /ˌɪnfərtˈɪlɪtˌiː/ 01 n. The state or quality of being infertile; unproductiveness; barrenness. 1. The state or quality of being infertile; unproductiveness; barrenness. “The infertility or noxiousness of the soil.” — Sir M. Hale.