Source : Webster's Revised Unabridged Dictionary (1913)

Gear \Gear\v. t. [imp. & p. p. {Geared}; p. pr. & vb. n.
   {Gearing}.]
   1. To dress; to put gear on; to harness.

   2. (Mach.) To provide with gearing.

   {Double geared}, driven through twofold compound gearing, to
      increase the force or speed; -- said of a machine.

Gearing \Gear"ing\, n.
   1. Harness.

   2. (Mach.) The parts by which motion imparted to one portion
      of an engine or machine is transmitted to another,
      considered collectively; as, the valve gearing of
      locomotive engine; belt gearing; esp., a train of wheels
      for transmitting and varying motion in machinery.

   {Frictional gearing}. See under {Frictional}.

   {Gearing chain}, an endless chain transmitted motion from one
      sprocket wheel to another. See Illust. of {Chain wheel}.
      

   {Spur gearing}, gearing in which the teeth or cogs are ranged
      round either the concave or the convex surface (properly
      the latter) of a cylindrical wheel; -- for transmitting
      motion between parallel shafts, etc.

Source : WordNet®

gearing
     n : 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"
         [syn: {gears}, {geartrain}, {power train}, {train}]