<p><strong>Noun</strong></p><ul><li>The Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches.</li><li>Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; the Christianity of Augustine's thought.</li><li>A particular Christian religious system: She followed fundamentalist Christianity.</li><li>The state of being a Christian.</li><li>Christendom.</li><li>Conformity to the Christian religion or to its beliefs or practices.</li></ul>