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3 definitions found
 for Horizon
From The Collaborative International Dictionary of English v.0.48 :

  Horizon \Ho*ri"zon\, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?)
     the bounding line, horizon, fr. ? to bound, fr. ? boundary,
     1. The line which bounds that part of the earth's surface
        visible to a spectator from a given point; the apparent
        junction of the earth and sky.
        [1913 Webster]
              And when the morning sun shall raise his car
              Above the border of this horizon.     --Shak.
        [1913 Webster]
              All the horizon round
              Invested with bright rays.            --Milton.
        [1913 Webster]
     2. (Astron.)
        (a) A plane passing through the eye of the spectator and
            at right angles to the vertical at a given place; a
            plane tangent to the earth's surface at that place;
            called distinctively the sensible horizon.
        (b) A plane parallel to the sensible horizon of a place,
            and passing through the earth's center; -- called also
            rational horizon or celestial horizon.
        (c) (Naut.) The unbroken line separating sky and water, as
            seen by an eye at a given elevation, no land being
            [1913 Webster]
     3. (Geol.) The epoch or time during which a deposit was made.
        [1913 Webster]
              The strata all over the earth, which were formed at
              the same time, are said to belong to the same
              geological horizon.                   --Le Conte.
        [1913 Webster]
     4. (Painting) The chief horizontal line in a picture of any
        sort, which determines in the picture the height of the
        eye of the spectator; in an extended landscape, the
        representation of the natural horizon corresponds with
        this line.
        [1913 Webster]
     5. The limit of a person's range of perception, capabilities,
        or experience; as, children raised in the inner city have
        limited horizons.
     6. [fig.] A boundary point or line, or a time point, beyond
        which new knowledge or experiences may be found; as, more
        powerful computers are just over the horizon.
     Apparent horizon. See under Apparent.
     Artificial horizon, a level mirror, as the surface of
        mercury in a shallow vessel, or a plane reflector adjusted
        to the true level artificially; -- used chiefly with the
        sextant for observing the double altitude of a celestial
     Celestial horizon. (Astron.) See def. 2, above.
     Dip of the horizon (Astron.), the vertical angle between
        the sensible horizon and a line to the visible horizon,
        the latter always being below the former.
     Rational horizon, and Sensible horizon. (Astron.) See
        def. 2, above.
     Visible horizon. See definitions 1 and 2, above.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: the line at which the sky and Earth appear to meet [syn:
           horizon, apparent horizon, visible horizon, sensible
           horizon, skyline]
      2: the range of interest or activity that can be anticipated;
         "It is beyond the horizon of present knowledge" [syn:
         horizon, view, purview]
      3: a specific layer or stratum of soil or subsoil in a vertical
         cross section of land
      4: the great circle on the celestial sphere whose plane passes
         through the sensible horizon and the center of the Earth
         [syn: horizon, celestial horizon]

From Moby Thesaurus II by Grady Ward, 1.0 :

  71 Moby Thesaurus words for "horizon":
     azimuth, background, clear sight, color vision, command, compass,
     cone vision, day vision, daylight vision, discernment, domination,
     eye, eye-mindedness, eyereach, eyeshot, eyesight, false horizon,
     farsight, farsightedness, field of view, field of vision,
     keen sight, ken, limit of vision, limits, line of sight, naked eye,
     night vision, offing, outlook, outlook over, perception,
     peripheral field, peripheral vision, perspective, perspicacity,
     perspicuity, photopia, power of sight, prospect, purview,
     quick sight, range, reach, remote distance, rod vision, scan,
     scope, scope of vision, scotopia, sea line, seeing, sense of sight,
     sensible horizon, sight, sightedness, sightliness, skyline, survey,
     sweep, the distance, twilight vision, unobstructed vision,
     vanishing point, view, visible horizon, vision, vista,
     visual acuity, visual field, visual sense

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