Source : Webster's Revised Unabridged Dictionary (1913)

Pace \Pace\, v. i. [imp. & p. p. {Paced}; p. pr. & vb. n.
   {Pacing}.]
   1. To go; to walk; specifically, to move with regular or
      measured steps. ``I paced on slowly.'' --Pope. ``With
      speed so pace.'' --Shak.

   2. To proceed; to pass on. [Obs.]

            Or [ere] that I further in this tale pace.
                                                  --Chaucer.

   3. To move quickly by lifting the legs on the same side
      together, as a horse; to amble with rapidity; to rack.

   4. To pass away; to die. [Obs.] --Chaucer.

Source : WordNet®

pacing
     n 1: (music) the speed at which a composition is to be played
          [syn: {tempo}]
     2: walking with slow regular strides