propositionalist
/ˌprɒpəˈzɪʃ(ə)nəlɪst/ /ˌprɒpəˈzɪʃ(ə)nəlɪst/Chiefly Philosophy and Theology
noun
A person who is concerned with logical propositions; a person given to considering or interpreting matters in terms of propositions.
Origin
1950s; earliest use found in Mind. From propositional + -ist.