n. [ Cf. F. rationalisme. ] 1. (Theol.) The doctrine or system of those who deduce their religious opinions from reason or the understanding, as distinct from, or opposed to, revelation. [ 1913 Webster ]
2. (Philos.) The system that makes rational power the ultimate test of truth; -- opposed to sensualism, or sensationalism, and empiricism. Fleming. [ 1913 Webster ]