Both Uses

principal
in
Someone Like You
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I pushed past girls in their princess outfits, past clouds of cologne and perfume, past Mrs. Oakley, the vice principal, who was eyeballing everyone on the lookout for drugs and drunks.†
Chpt 18 *

principal = most important; or person that is most important
Mrs. Vaughn just called and said Noah had been found drunk in the school parking lot and Norman had to go down there to pick him up from the principal, she's completely hysterical and no one knew what happened to you.†
Chpt 18

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.