What is the difference between principal and principle? I frequently come across these words and get confused.
These are often confused by many people, and here are the most common meanings I've encountered (a good dictionary will certainly provide more uses of these two words), followed by simple mental imagery you can use to help with remembering the difference:
Principal: A "lead" position (in management, or some other hierarchy), such as the Principal of a school. "You'd better straighten up, the Principal is just around the corner!"
Principle: A rule, such as one based on ethics and/or morals. "Your honour, I'm suing the defendant for $1.00 not because I need the money, but because it's a matter of principle!"
The trick I use to remember the difference is to imagine an elementary school student who unintentionally broke a rule but just got a second chance (so [s]he didn't have to go to detention) and is now thinking "The Principal is my pal!"
Basically, if it ends with "pal" then it applies to a person who possibly could be your pal.