1. a set of gears and related parts in a motor vehicle that transmits power from the engine to the wheels and allows the driver to change speed and direction
Usage: commonly used in automotive contexts
2. any mechanical system of gears that transmits and modifies rotational motion or torque
Usage: general mechanical engineering term

Examples

• The car's gearbox allows the driver to shift between different gears for acceleration and speed control.
• A damaged gearbox can make it difficult to change gears smoothly.
• Modern automatic gearboxes adjust gear ratios without driver input.
• The truck's heavy-duty gearbox is designed to handle heavy loads.
• The mechanic replaced the worn gearbox with a new one.
• Industrial machinery often uses a gearbox to reduce engine speed and increase torque.