A fundamental law-the word principle has many meanings; however, school administration is not one of them. the person who is in charge of a school in a principal, not a principle. the word principle means a comprehensive and fundamental law, doctrine, or assumption or a rule or code of conduct, a moral rule or belief that helps you know what is right and wrong and that influences your actions. it can also mean the primary source or origin. examples of usage:his investment strategy is based on the principle that the stock market offers the best returns for long-term investors. as a matter of principle, he would not accept the gift.its against my principles to cheat.