Webster's English Dictionary

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religion

re.li.gion \ri-'lij-*n\ n [ME religioun, fr. L religion-, religio 
   reverence, religion,]prob. fr. religare to tie back - more at RELY 1a1: the 
   service and worship of God or the supernatural  1a2: commitment or devotion 
   to religious faith or observance  1b: the state of a religious  2: a 
   personal set or institutionalized system of religious attitudes, belie fs, 
   and practices archaic  3: scrupulous conformity : CONSCIENTIOUSNESS  4: a 
   cause, principle, or system of beliefs held to with ardor and faith