principle - correct spelling
principle - noun
Note: For a discussion of the differences between principal and principle, see Grammar.com’s section on Common Grammatical Mistakes. Click here for the beginning of that discussion.
Example: This is a moral principle you must observe. noun
Example: He paid off the principal of the loan. noun
Example: The principal called the parents of the unruly student. noun
Example: His principal argument is weak at best. adjective