Source : Webster's Revised Unabridged Dictionary (1913)

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.

   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.

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

   {A["e]rial navigation}, the act or art of sailing or floating
      in the air, as by means of ballons; a["e]ronautic.

Source : WordNet®

navigation
     n 1: the guidance of ships or airplanes from place to place [syn:
           {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}, {sailing}]