mysticism

n. mystical spiritualism

Mysticism (from the Greek μυστικός (mystikos) "an initiate" (of the Eleusinian Mysteries, μυστήρια (mysteria) meaning "initiation")) is the pursuit of achieving communion identity with, or conscious awareness of, ultimate reality, the divine, spiritual truth, or God through direct experience, intuition, or insight. Traditions may include a belief in the literal existence of dimensional realities beyond empirical perception, or a belief that a true human perception of the world goes beyond logical reasoning or intellectual comprehension. A person delving in these areas may be called a Mystic.
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Noun
1. a religion based on mystical communion with an ultimate reality
(synonym) religious mysticism
(hypernym) religion, faith, religious belief
(hyponym) quietism
2. obscure or irrational thought
(hypernym) thinking, thought, cerebration, intellection, mentation

(n.)
The doctrine that the ultimate elements or principles of knowledge or belief are gained by an act or process akin to feeling or faith.
  

(n.)
The doctrine of the Mystics, who professed a pure, sublime, and wholly disinterested devotion, and maintained that they had direct intercourse with the divine Spirit, and aquired a knowledge of God and of spiritual things unattainable by the natural intellect, and such as can not be analyzed or explained.
  

(n.)
Obscurity of doctrine.
  

In philosophy, the belief, tendency to believe, or doctrine that there are momentous realities apprehensible only subjectively and nonrationally.