The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         It was often found impossible to track the robbers to
         their retreats among the hills and morasses.
                                                  --Macaulay.
   [1913 Webster]

   2. (Naut.) To draw along continuously, as a vessel, by a
      line, men or animals on shore being the motive power; to
      tow.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tracking
    n 1: the pursuit (of a person or animal) by following tracks or
         marks they left behind [syn: trailing, tracking]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "tracking":
   automatic tracking, chase, data transmission, dogging,
   flector tuning, follow, follow-up, following, hue and cry, hunting,
   locking on, locking signals, mapping, phase adjustment,
   pinpointing, precision focusing, prosecution, pursuance, pursuing,
   pursuit, quest, radar navigation, radar-telephone relay,
   range finding, scan conversion, scanning, searching, seeking,
   shadowing, signal modulation, stalking, three-pointing,
   tracking down, trailing, triangulation, triggering signals



The Free On-line Dictionary of Computing (30 December 2018):

tracking

    The horizontal spacing between characters in a line of
   text.  Tracking is set when a font is designed but can often
   be altered in order to change the appearance of the text or for
   special effects.  It applies to both proportional fonts and
   monospaced fonts.

   Tracking should not be confused with kerning which deals with
   the spacing between certain pairs of characters in a proportional
   font.

   See also leading.

   (2013-12-05)