Legal Definition of Doctrine: A belief; a tenet; a government policy, such as the Doctrine that all people are created equal | Learn about the legal definition of doctrine and its impact on our society. Understand how doctrine shapes our laws and regulations, and why it is crucial for business owners to have a comprehensive understanding. Discover examples of doctrine in different areas of law, and the importance of doctrine in legal arguments and interpretations. Navigate the legal landscape with confidence and make informed decisions by familiarizing yourself with the doctrines that shape our legal system