highest in importance or position; main; chief
the head of some universities, colleges and schools
an amount of money lent, put into a business, etc. and on which interest is paid
person for whom another acts as his agent
person directly responsible for a crime
"she sent unruly pupils to see the principal"
"the chief aim of living"
"the main doors were of solid glass"
"the principal rivers of America"
"the principal example"
"policemen were primary targets"
"the master bedroom"
"a master switch"
His principal and most successful business venture.
出自： J. Thurber
The principal source of information.
出自： N. Gordimer
What's your principal reason for wanting to be a writer？
If you want to leave early you'll have to ask the Principal.
He's a boy with very strong principles.