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