E0024600 (ĭ-klē′zē-ŏl′ə-jē)n.1. The branch of theology that is concerned with the nature, constitution, and functions of a church.2. The study of ecclesiastical architecture and ornamentation.[ecclesi(a) + -logy.]ec·cle′si·o·log′i·cal(-ə-lŏj′ĭ-kəl) adj.EncyclopediaSeeecclesiology