IVF Meaning of IVF in English IVF /ˌaɪ viː ˈef/ BrE AmE noun [uncountable] (in vitro fertilization) a process in which a human egg is ↑ fertilize d outside the woman’s body ⇨ test-tube baby Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012