Webster's English Dictionary

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mysticism

mys.ti.cism \'mis-t*-.siz-*m\ n 1: the experience of mystical union or 
   direct communion with ultimate reali ty reported by mystics 2a: religion 
   based on mystical communion  2b: a theory of mystical knowledge  3a: 
   obscure or irrational speculation  3b: a theory postulating the possibility 
   of direct and intuitive acquisitio n of ineffable knowledge or power