mysticism

Main Entry: mys·ti·cism Pronunciation: 'mis-t&-"si-z&m Function: noun
Date: 1736 1 : the experience of mystical union or direct communion with ultimate reality reported by mystics 2 : the belief that direct knowledge of God, spiritual truth, or ultimate reality can be attained through subjective experience (as intuition or insight) 3 a : vague speculation : a belief without sound basis b : a theory postulating the possibility of direct and intuitive acquisition of ineffable knowledge or power 

mysticism (mĭs´tĭsĭzm) [Gr.,=the practice of those who are initiated into the mysteries], the practice of putting oneself into, and remaining in, direct relation with God, the Absolute, or any unifying principle of life.