theorize UK /ˈθɪə.ɹaɪz/US /ˈθɪɹ.aɪz/ verb4 •To formulate a theory, especially about some specific subject.There are processes of collective individuation that produce the transindividual in the course of a process of transindividuation (which Simondon does not theorize as such). — 2018 •Non-Oxford British English standard spelling of theorize. •to theorize (to formulate a theory, especially about some specific subject) •To speculate. formstheorized · theorizing · theorizes