Verb

1. Set the level or character of

Noun

1. A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

2. Wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed

3. A mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)

4. Equipment consisting of miscellaneous articles needed for a particular operation or sport etc.