rationalism
Ra"tion*al*ism, n. Etym: [Cf. F. rationalisme.] 1. (Theol.) Defn: The doctrine or system of those who deduce their religious opinions from reason or the understanding, as distinct from, or opposed to, revelation. 2. (Philos.) Defn: The system that makes rational power the ultimate test of truth; -- opposed to sensualism, or sensationalism, and empiricism. Fleming.