1. An individual who is not a public figure, government official, or acting in an official capacity; a private citizen
As a private person, she has the right to privacy.
Como pessoa privada, ela tem direito à privacidade.
2. In legal contexts, a natural person (as opposed to a legal entity or corporation)
The contract was signed between a private person and a company.
O contrato foi assinado entre uma pessoa privada e uma empresa.