Entry 2 senses · 2 variants Webster, 1913 non-Catholic · IPA /nɑnkˈæθlɪk/ a. n. 01 a. Not Roman Catholic; not adhering to the Catholic religion. 1. Not Roman Catholic; not adhering to the Catholic religion. 02 n. A person who is not a Roman Catholic. 1. A person who is not a Roman Catholic.