principal ( principals plural )
1 adj Principal means first in order of importance.
The principal reason for my change of mind is this., ...the country's principal source of foreign exchange earnings..., Their principal concern is bound to be that of winning the next general election.
2 n-count The principal of a school, or in Britain the principal of a college, is the person in charge of the school or college.
Donald King is the principal of Dartmouth High School.
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