Definitions of gear:

• noun:   a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
• noun:   equipment consisting of miscellaneous articles needed for a particular operation or sport etc.
• noun:   a mechanism for transmitting motion by gears for some specific purpose (as the steering gear of a vehicle)
• verb:   set the level or character of
• name:  A surname (very rare: popularity rank in the U.S.: #26561)