gear gear /ˈgɪr/

noun

1. () A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion  ( cogwheel , gear wheel , geared wheel , gear )
   a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
   
   
2. Equipment consisting of miscellaneous articles needed for a particular operation or sport etc.  ( appurtenance , gear , paraphernalia )
   equipment consisting of miscellaneous articles needed for a particular operation or sport etc.
   
   
3. A mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)  ( gear , gear mechanism )
   a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)
   
   
4. Wheelwork consisting of a connected set of rotating gears by which force is transmitted, motion or torque is changed  ( gear , gearing , geartrain , power train , train , drivetrain )
   wheelwork consisting of a connected set of rotating gears by which force is transmitted, motion or torque is changed
    The fool got his tie caught in the geartrain
   the fool got his tie caught in the geartrain
   
   

verb

1. () Set the level or character of  ( pitch , gear )
   set the level or character of
    She pitched her speech to the teenagers in the audience
   She pitched her speech to the teenagers in the audience