This is the 2054th most frequent Portuguese word.
câmbio
"Exchange" or "gearshift," depending on context.
Here, 'câmbio' refers to the mechanical transmission system in a vehicle.
Preciso trocar o câmbio do meu carro.
I need to replace the transmission of my car.
In this context, 'câmbio' is used to mean the currency exchange rate.
Qual é a taxa de câmbio do dólar hoje?
What is the exchange rate for the dollar today?
Here, 'câmbio' refers to the act of exchanging money, typically currency conversion.