Noun christianity has 2 senses
  1. Christianity, Christian religion - a monotheistic system of beliefs and practices based on the Old Testament and the teachings of Jesus as embodied in the New Testament and emphasizing the role of Jesus as savior
    --1 is a kind of religion, faith, religious belief
    --1 has particulars:
     Adventism, Second Adventism; Catholicism, Catholicity; Albigensianism, Catharism; Donatism; Protestantism; Tractarianism, Puseyism
  2. Christendom, Christianity - the collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia); "for a thousand years the Roman Catholic Church was the principal church of Christendom"
    --2 is a kind of body
    --2 has parts: church, Christian church; church
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