Rā'tion-al-ist, n.
(rāsh'un-), n. [Fr. rationaliste, Sp. racionalista.]
Sense 1. One who proceeds in his disquisitions and practice wholly upon reason. Bacon.
Sense 2. One who relies on his reason as the sole or the supreme authority in matters of religion, and rejects supernatural guidance and aid; a disbeliever in the supernatural origin of the Christian religion.