All 7 Uses

principal
in
Perfect Chemistry
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I knew I'd be called into the new principal's office at some point during the year, but I didn't expect it to be on the first day of school.†
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principal = most important; or person that is most important
Paco attempted to tell the truth, but our old principal wouldn't listen.†
Is she jealous I'm Alex's chem partner, or does she think I reported her boyfriend to the principal today?†
I can kill two birds with one stone: get back at Burro Face by taking his girl and get back at Brittany Ellis for having me called into the principal's office and dissin' me in front of her friends.†
Let me assure you as your new principal my goal is to bridge any gap in the school culture that negates that motto.†
I'm not about to taint Aguirre's rosy picture of our motto, because I'm starting to believe our principal actually believes the crap he's spouting.†
I'm ready to accept that my chem teacher and new principal might not be on my side ....but I'm not sure they're on the other side, either.†

Definitions:

(1) (principal)
most important; or person who is most important
The exact meaning of principal can depend upon its context. For example:
- "the principal idea" or "the principal performer" -- the most important
- "the principal of the school" -- the person in charge
- "a principal of a company" -- an owner or person with controlling authority
- "the principal in a transaction" (as contrasted to the agent) -- the person on whose behalf an agent acts
(2) (meaning too rare to warrant focus)
See a comprehensive dictionary for specialized senses in finance, architecture, law, chemistry, and music.