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English definition of “principal”

principal

adjective [before noun] uk   /ˈprɪn.sɪ.pəl/ us  
B1 first in order of importance: Iraq's principal export is oil. He was principal dancer at the Dance Theatre of Harlem. That was my principal reason for moving.

principal

noun uk   /ˈprɪn.sɪ.pəl/ us  

principal noun (PERSON)

A2 [C] US the person in charge of a school or college for children aged between approximately eleven and 18

principal noun (MONEY)

[C usually singular] specialized finance & economics an amount of money that someone has invested in a bank or lent to a person or organization so that they will receive interest on it from the bank, person, or organization: She lives off the interest and tries to keep the principal intact.
(Definition of principal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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