noun, plural Christianities.
the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches.
Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; the Christianity of Augustine's thought.
a particular Christian religious system: She followed fundamentalist Christianity.
the state of being a Christian.
conformity to the Christian religion or to its beliefs or practices.

1250–1300; Middle English cristianite < Latin chrīstiānitāt- (stem of chrīstiānitās), equivalent to chrīstiān- Christian + -itāt- -ity; replacing Middle English cristiente < Middle French < Latin, as above Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Christianity (ˌkrɪstɪˈænɪtɪ)
1.  the Christian religion
2.  Christian beliefs, practices or attitudes
3.  a less common word for Christendom

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, cristente, from O.Fr. crestienté, from L. christianitatem, noun of state from christianus (see Christian). Gradually respelled to conform with Latin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

Christianity definition

The religion based on the life and teachings of Jesus Christ. Christians believe that Jesus Christ is the Messiah, sent by God. They believe that Jesus, by dying and rising from the dead, made up for the sin of Adam and thus redeemed the world, allowing all who believe in him to enter heaven. Christians rely on the Bible as the inspired word of God. (See also gospel, Nativity, Resurrection, salvation, and Sermon on the Mount.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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