CHRISTIANITY
Christianity, Christian religion
(noun) 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
Christendom, Christianity
(noun) 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”
Source: WordNet® 3.1
Chris*tian"i*ty, n. Etym: [OE. cristiente, OF. cristienté, F.
chrétienté, fr. L. christianitas. ]
1. The religion of Christians; the system of doctrines and precepts
taught by Christ.
2. Practical conformity of one's inward and outward life to the
spirit of the Christian religion
3. The body of Christian believers. [Obs.]
To Walys fled the christianitee Of olde Britons. Chaucer.
Source: Webster’s Unabridged Dictionary 1913 Edition