1. A task or responsibility that is not mandatory but may be undertaken at the discretion of the individual or organization
Attending the company picnic is an optional duty for all employees.
Participar do piquenique da empresa é um dever opcional para todos os funcionários.
2. In legal or contractual contexts, a duty that is not binding or required by law or agreement
The additional training sessions are optional duties that employees can choose to participate in.
As sessões de treinamento adicional são deveres opcionais nos quais os funcionários podem optar por participar.