fac·tive I. \ˈfaktiv, -tēv, -təv\adjective Etymology: Medieval Latin factivus, from Latin factus + -ivus -ive 1.obsolete: having power to make : constructive 2. a.of a grammatical case: denoting a process of becoming or transmutation b.: factitive II. noun (-s) : the factive case of a language; also: a form in the factive case