Definitions
1.NounThe theory that reason is a source of knowledge independent of and superior to sense perception.
2.NounThe theory that knowledge may be derived by deductions from a priori concepts (such as axioms, postulates or earlier deductions).
3.NounA view that the fundamental method for problem solving is through reason and experience rather than faith, inspiration, revelation, intuition or authority.
4.NounElaboration of theories by use of reason alone without appeal to experience, such as in mathematical systems.