Definition of principal noun from the Oxford Advanced American Dictionary

      

    principal

     noun
    noun
    NAmE//ˈprɪnsəpl//
     
     
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  1. 1 a teacher who is in charge of a school Principal Ray Smith
  2. 2[usually singular] (finance) an amount of money that you lend to someone or invest to earn interest
  3. 3the person who has the most important part in a play, an opera, etc. The performance of the two principals is disappointing.
  4. 4(technology) a person that you are representing, especially in business or law The shareholders are principals and the managers are agents.
  5. 5 the most important person in a company or organization
See the Oxford Advanced Learner's Dictionary entry: principal