A triggering device attached to the machine gun armament of fighter aircraft so that the gun could fire through the arc of a spinning propeller without the bullets striking the blades.

(automotive) That part of a gearbox involved in changing gear, including the lever and the forks attached to it. / (automotive, US, Canada) The lever or other interface a human uses to shift gears.

plural of gear ratio

The highest gear that is available in a motor vehicle or car.

a system of gears that has a central gear wheel around which others rotate, often within an outer ring

A system of gears that has a central gear wheel (sun gear) around which others (planet gears) rotate, often within an outer ring.

(mechanics) A wheel with a toothed rim, intended to engage with others, or similar equipment, to form a gear.

An arrangement of bevel gears permitting the rotation of two shafts at two different speeds whilst supplying the same torque; used on the drive axles or between the driven wheels of automobiles to aid cornering.

(uncountable, countable, aviation) The wheels, tyres, brakes, shock absorbers etc of an aircraft; its undercarriage.

(mechanical engineering) A system of interconnected gears.