1. Heads of schools or educational institutions
The principals of the local schools met to discuss curriculum changes.
Os diretores das escolas locais se reuniram para discutir mudanças curriculares.
2. People who hold the most important or leading position in an organization or activity
The principals in the negotiation were the two company CEOs.
Os principais envolvidos na negociação eram os dois CEOs da empresa.
3. The original amount of money borrowed or invested, excluding interest
The principals of the loan must be repaid within five years.
O principal do empréstimo deve ser reembolsado em cinco anos.
4. Leading performers in a theatrical production or ballet company
The principals of the opera performed brilliantly on opening night.
Os intérpretes principais da ópera atuaram brilhantemente na noite de abertura.