All 3 Uses

principal
in
Hoops, by Walter Dean Myers
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We went to the office, and Cal met the principal, a white dude.†
p. 38.2 *

principal = most important; or person that is most important
I don't know how he got to know all of these people, this principal, Sweet Man, or how he got the gym in the first place, but I was a little proud of him.†
p. 38.2
He's the principal here now.†
p. 38.4

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.