Bible/ˈbaɪbl/ Definition 1 of 2Pro Tip 1/3Religious Text The term 'bible' refers to a sacred text in Christianity, central to its teachings. I have a family heirloom that is a 200-year-old Bible. Pro Tip 2/3Capitalization When referring to the Christian text, 'Bible' is capitalized as it's a proper noun. The Bible is divided into the Old Testament and the New Testament. Pro Tip 3/3Respectful Context Use 'Bible' respectfully, as it is a holy book for many people. The priest quoted the Bible during his sermon.