All 4 Uses

principal
in
Chandra's Wars
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Mr. Selalame talked to the principal at the elementary and, well, the rest is history.†
Chpt 1.2 *

principal = most important; or person that is most important
I spend lunch hour explaining to the principal how I let it happen.†
Chpt 1.2
Only the principal has a phone.†
Chpt 1.4
I have a word with the principal about starting back to work in a few weeks.†
Chpt 5.43

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.