In the Kantian system, of or pertaining to that
   which can be determined a priori in regard to the fundamental
   principles of all human knowledge. What is transcendental, therefore,
   transcends empiricism; but is does not transcend all human knowledge,
   or become transcendent. It simply signifies the a priori or necessary
   conditions of experience which, though affording the conditions of
   experience, transcend the sphere of that contingent knowledge which is
   acquired by experience.