Transcendental: the meaning

transcendental
ˌtransɛnˈdɛnt(ə)l,ˌtrɑːn-/
adjective
adjective: transcendental
  1. 1.
    relating to a spiritual realm.
    “the transcendental importance of each person’s soul”
    • relating to or denoting Transcendentalism.
  2. 2.
    (in Kantian philosophy) presupposed in and necessary to experience; a priori.
  3. 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.
Origin
early 17th century: from medieval Latin transcendentalis (see transcendent).