Entry 1 sense Webster, 1913 Exfetation · Ex·fe·ta·tion · IPA /ˌɛksfiːˈteɪʃən/ 01 n Imperfect fetation in some organ exterior to the uterus; extra-uterine fetation. 1. Imperfect fetation in some organ exterior to the uterus; extra-uterine fetation.(Med.)