Principal‘s primary definitions are (1) first or highest in importance or rank, (2) one who holds a presiding position or rank, and (3) capital or property before interest. Principle is only a noun. It means, primarily, a basic truth, law, assumption, or rule.
Examples
These writers use principal well:
The upcoming production of the webisode, “The Roomers” is now casting for principal actors. [My-Ishia's Michigan Movie Industry Blog]
But even if his principal objection is a matter of principle . . . [Tablet Mag]
The school principal notified students’ parents about the case by e-mail and by posting a letter on the school Web site. [Houston Chronicle]
And these writers use principle well:
Although Rule 11 applies to only federal courts, the same principle applies to all plea hearings in all courts. [Pub Record]
It is a fundamental principle in the modern world that disabled people should be given the opportunity to participate in modern society with as few impediments as possible. [Emergency Planning]
