Definition of propositionize in English:
propositionize
(also propositionise)
verb ˌprɒpəˈzɪʃ(ə)nʌɪzˌprɒpəˈzɪʃənʌɪz
no object To utter propositional speech, or formulate propositional language.
Origin
Late 19th century. From proposition + -ize. Compare earlier propositionizing.