transcendental

adjective

• 1relating to a spiritual realm:the transcendental importance of each person’s soul
• relating to or denoting Transcendentalism.

• 2(in Kantian philosophy) presupposed in and necessary to experience; a priori.

• 3 Mathematics (of a number, e.g. e or π) real but not a root of an algebraic equation with rational coefficients.
• (of a function) not capable of being produced by the algebraical operations of addition, multiplication, and involution, or the inverse operations.