The root word of doctrine

A doctrine is a set of beliefs. The word comes from the Latin doctor for “teacher,” so think of a doctrine is the teachings of a school, religion, or political group. ... Doctrine and doctor derive from the same Latin word, docere, which means "to teach": doctor means "teacher," and doctrina means "teaching, learning." Doctrine (from Latin: doctrina, meaning "teaching, instruction") is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the essence of teachings in a given branch of knowledge or in a belief system. The etymological Greek analogue is "catechism".