1. A secondary or supplementary part that is not essential to the main function but enhances or completes a system or device
The car's leather seats are an accessory component that adds luxury to the interior.
Os assentos de couro do carro são um componente acessório que adiciona luxo ao interior.
2. In manufacturing or engineering, a part that supports or complements the primary components
The cooling fan is an accessory component in the computer's thermal management system.
O ventilador de refrigeração é um componente acessório no sistema de gestão térmica do computador.