If we're going to get technical, the transmission of a vehicle is everything that exists between the motor and wheels. Americans tend to think of the gearbox when referring to a car's transmission; much like we call a computer a CPU and we also refer to a single chip inside the computer a CPU. A gearbox with two gears is still a gearbox.

I'm still waiting for the ultimate EV that's got 4 in-hub direct drive motors. Until then, we're stuck with transmissions.