Topic: EDUCATION
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principal2
1 someone who is in charge of a school [= headteacher British English] 
a small school with just three teachers and the principal
school
[countable] American EnglishSEa small school with just three teachers and the principal2 someone who is in charge of a university or college
university/college
SE [countable] British English3 the main person in a business or organization, who can make important business decisions and is legally responsible for them : The principal of the business has an office in New York.
business
[countable] American EnglishThe principal of the business has an office in New York.4 the main performer in a play or in a group of musicians, dancers etc : She later became a principal with the Royal Ballet.
performer
[countable]APShe later became a principal with the Royal Ballet.5 the original amount of money that is lent to someone, not including any of the interest
