1. A component or element that may be included or excluded according to the user's preference or requirements
The sunroof is an optional part on this car model.
O teto solar é uma peça opcional neste modelo de carro.
2. In technical or manufacturing contexts, a replaceable or supplementary component that is not essential to basic functionality
The extended warranty is an optional part of the purchase package.
A garantia estendida é uma peça opcional do pacote de compra.