gear

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

wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed; "the fool got his tie caught in the geartrain"

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

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

set the level or character of; "She pitched her speech to the teenagers in the audience"