Principal vs. Principle Is the head of a school called a principal or a principle? These two words are frustratingly similar, leaving even the most experienced English speakers to second-guess which word means what. So, today, we’ll discuss the distinct meanings between these easy-to-confuse terms—and leave you with a little trick to help differentiate between your principals and your principles. What is a principal? A principal is “a chief or head, particularly of a school.” Principal can also be used as an adjective meaning “first or highest in rank, importance, or value,” as in The principal objective of this article is to teach you the difference between two words. WATCH: How This School Principal Uses Words To Make Change Happen Previous Next What is principle? A principle, on the other hand, is “rule of action or conduct” or “a fundamental doctrine or tenet.” Principle is often associated with and used as a synonym for moral, meaning “of, relating to, or concerned with the principles or rules of right conduct or the distinction between right and wrong.” Are principal and principle related? As you may have guessed, principal and principle are etymologically related.Principal stems from the Latin prīncipālis, a word meaning “first, chief.” Principle comes from prīncipium, meaning “beginning, origin, starting point, basis.” Both terms can ultimately be traced to the Latin word prīmus, meaning “first, foremost,” hence the English prime. How can I remember the difference between principal and principle? If you find yourself having trouble choosing between principal and principle, think about the context. Use principal in reference to a person who is in leadership or to describe the importance of something; use principle to refer to a standard, rule, or guiding belief. One popular mnemonic device to remember this difference is the isolation of “pal” from principal. The principal of your school is your “pal” … ideally. Don't Get Mixed Up Again! Get Dictionary.com tips to keep words straight ... right in your inbox. Email address* Valid email addressEmailThis field is for validation purposes and should be left unchanged.