principal (EN)

adjective, noun

adjective “principal”

1. most important; main
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   The principal reason for his success is his dedication.

noun “principal”

1. the person in charge of a school
   The principal announced new policies during the school assembly.
2. the original amount of money lent or invested, excluding interest
   She is focused on paying off the principal of her mortgage.
3. (law) a person who authorizes an agent to act on their behalf
   The principal granted his attorney the power to act on his behalf.
4. a main performer or lead actor
   After years of hard work, she became a principal in the ballet company.