1. A part or element that is not needed or required for something to function properly
The extra buttons on the device are unnecessary components that add to its cost.
Os botões extras no dispositivo são componentes desnecessários que aumentam seu custo.
2. In software or engineering, a module or part that does not contribute essential functionality
Removing unnecessary components from the code improved its performance.
Remover componentes desnecessários do código melhorou seu desempenho.