The Collaborative International Dictionary of English v.0.48:

Navigation \Nav`i*ga"tion\, n. [L. navigatio: cf. F.
   navigation.]
   1. The act of navigating; the act of passing on water in
      ships or other vessels; the state of being navigable.
      [1913 Webster]

   2.
      (a) The science or art of conducting ships or vessels from
          one place to another, including, more especially, the
          method of determining a ship's position, course,
          distance passed over, etc., on the surface of the
          globe, by the principles of geometry and astronomy.
      (b) The management of sails, rudder, etc.; the mechanics
          of traveling by water; seamanship.
          [1913 Webster]

   3. Ships in general. [Poetic] --Shak.
      [1913 Webster]

   Aerial navigation, the act or art of sailing or floating in
      the air, as by means of airplanes or ballons; aviation;
      aeronautic.

   Inland navigation, Internal navigation, navigation on
      rivers, inland lakes, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

navigation
    n 1: the guidance of ships or airplanes from place to place
         [syn: navigation, pilotage, piloting]
    2: ship traffic; "the channel will be open to navigation as soon
       as the ice melts"
    3: the work of a sailor [syn: seafaring, navigation,
       sailing]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "navigation":
   VAR, aim, astronavigation, automatic electronic navigation,
   azimuth, bearing, bent, boating, canoeing, cartography,
   celestial navigation, chorography, circumnavigation, coasting,
   consolan, course, cruising, current, direction, direction line,
   drift, electronic navigation, geodesy, geodetic satellite,
   geography, gunkholing, heading, helmsmanship, inclination, lay,
   lie, line, line of direction, line of march, loran, motorboating,
   navar, navigability, navigating, omnidirectional range, omnirange,
   orbiting geophysical observatory, orientation, passage-making,
   periplus, pilotage, piloting, point, quarter, radar,
   radio navigation, range, rowing, run, sailing, sculling,
   sea travel, seafaring, seamanship, set, shoran, steaming, steerage,
   steering, surveying, tacan, teleran, tendency, tenor, topography,
   track, travel by water, trend, visual-aural range, voyaging,
   water travel, way, yachting



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

navigation
navigating

    Finding your way around a website.
   Many sites have some kind of navigation bar.  One of
   the first web browsers was called Netscape Navigator.

   (2008-11-17)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

NAVIGATION. The act of traversing the sea, rivers or lakes, in ships or
other vessels; the art of ascertaining the geographical position of a ship,
and directing her course.
     2. It is not within the plan of this work to copy the acts of congress
relating to navigation, or even an abstract of them. The reader is referred
to Story's L. U. S. Index, h.t.; Gordon's Dic. art. 2905, et seq.