Etymology
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Christianity (n.)

c. 1300, cristente, "Christians as a whole; state of being a Christian; the religion founded by Jesus," from Old French crestienté "Christendom; spiritual authority; baptism" (Modern French chrétienté), from Church Latin christianitatem (nominative christianitas), noun of state from christianus (see Christian). Gradually respelled to conform with Latin. Christendom is the older word for it. Old English also had cristennes.

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Definitions of Christianity

Christianity (n.)
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;
Synonyms: Christian religion
Christianity (n.)
the collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia);
Synonyms: Christendom
From wordnet.princeton.edu