transcendental
US /ˌtræn.senˈden.t̬əl/
UK /ˌtræn.senˈden.t̬əl/

1.
relating to a spiritual or nonphysical realm; beyond the limits of ordinary experience.
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The philosopher discussed the concept of transcendental meditation.
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She sought a transcendental experience through nature.
2.
(in Kantian philosophy) relating to the a priori or necessary conditions for knowledge.
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Kant's critique explores the transcendental conditions of human understanding.
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The concept of transcendental idealism is central to his philosophy.