Webster's English Dictionary

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christianity

Chris.tiani.t.y \.kris(h)-che--'an-*t-e-, kris(h)-'chan-\ n 1: the whole 
   body of Christian believers  2: the religion derived from Jesus Christ, 
   based on the Bible as sacred scr ipture, and professed by Eastern, Roman 
   Catholic, and Protestant bodies 3: conformity to the Christian religion