Source : Webster's Revised Unabridged Dictionary (1913)

Track \Track\, n. [OF. trac track of horses, mules, trace of
   animals; of Teutonic origin; cf.D. trek a drawing, trekken to
   draw, travel, march, MHG. trechen, pret. trach. Cf. {Trick}.]
   1. A mark left by something that has passed along; as, the
      track, or wake, of a ship; the track of a meteor; the
      track of a sled or a wheel.

            The bright track of his fiery car.    --Shak.

   2. A mark or impression left by the foot, either of man or
      beast; trace; vestige; footprint.

            Far from track of men.                --Milton.

   3. (Zo["o]l.) The entire lower surface of the foot; -- said
      of birds, etc.

   4. A road; a beaten path.

            Behold Torquatus the same track pursue. --Dryden.

   5. Course; way; as, the track of a comet.

   6. A path or course laid out for a race, for exercise, etc.

   7. (Railroad) The permanent way; the rails.

   8. [Perhaps a mistake for tract.] A tract or area, as of
      land. [Obs.] ``Small tracks of ground.'' --Fuller.

   {Track scale}, a railway scale. See under {Railway}.

Track \Track\, v. t. [imp. & p. p. {tracked}; p. pr. & vb. n.
   {tracking}.]
   To follow the tracks or traces of; to pursue by following the
   marks of the feet; to trace; to trail; as, to track a deer in
   the snow.

         It was often found impossible to track the robbers to
         their retreats among the hills and morasses.
                                                  --Macaulay.

   2. (Naut.) To draw along continuously, as a vessel, by a
      line, men or animals on shore being the motive power; to
      tow.

Source : WordNet®

track
     n 1: a line or route along which something travels or moves; "the
          hurricane demolished houses in its path"; "the track of
          an animal"; "the course of the river" [syn: {path}, {course}]
     2: evidence pointing to a possible solution; "the police are
        following a promising lead"; "the trail led straight to
        the perpetrator" [syn: {lead}, {trail}]
     3: a pair of parallel rails providing a runway for wheels
     4: a course over which races are run [syn: {racetrack}, {racecourse},
         {raceway}]
     5: a distinct selection of music from a recording or a compact
        disc; "he played the first cut on the cd"; "the title
        track of the album" [syn: {cut}]
     6: an endless metal belt on which tracked vehicles move over
        the ground [syn: {caterpillar track}, {caterpillar tread}]
     7: (computer science) one of the circular magnetic paths on a
        magnetic disk that serve as a guide for writing and
        reading data [syn: {data track}]
     8: a groove on a phonograph recording
     9: a bar or bars of rolled steel making a track along which
        vehicles can roll [syn: {rail}, {rails}]
     10: any road or path affording passage especially a rough one
         [syn: {cart track}, {cartroad}]
     11: the act of participating in an athletic competition
         involving running on a track [syn: {running}]

track
     v 1: carry on the feet and deposit; "track mud into the house"
     2: observe or plot the moving path of something; "track a
        missile"
     3: go after with the intent to catch; "The policeman chased the
        mugger down the alley"; "the dog chased the rabbit" [syn:
        {chase}, {chase after}, {trail}, {tail}, {tag}, {give
        chase}, {dog}, {go after}]
     4: travel across or pass over; "The caravan covered almost 100
        miles each day" [syn: {traverse}, {cover}, {cross}, {pass
        over}, {get over}, {get across}, {cut through}, {cut
        across}]
     5: make tracks upon

Source : Free On-Line Dictionary of Computing

track
     
         The part of a {disk} which passes under one
        read/write head while the head is stationary.  The number of
        tracks on a disk surface therefore corresponds to the number
        of different radial positions of the head(s).  The collection
        of all tracks on all surfaces at a given radial position is
        known a {cylinder} and each track is divided into {sectors}.
     
        (1997-07-15)