1. [n]  the act of looking or seeing or observing; "he tried to get a better view of it"; "his survey of the battlefield was limited"
2. [n]  a optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
3. [n]  the range of vision; "out of sight of land"
4. [n]  the ability to see; the faculty of vision
5. [n]  an instance of visual perception; "the sight of his wife brought him back to reality"; "the train was an unexpected sight"
6. [n]  a range of mental vision; "in his sight she could do no wrong"
7. [n]  anything that is seen; "he was a familiar sight on the television"; "they went to Paris to see the sights"
8. [n]  (often followed by `of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "it must have cost plenty"
9. [v]  catch sight of; to perceive with the eyes; "caught sight of the kings men coming over the ridge."

Sight
Explores the sense of sight and the body parts used to produce it.

more details ...

1. \Sight\, n. [OE. sight, si?t, siht, AS. siht, gesiht,
   gesih?, gesieh?, gesyh?; akin to D. gezicht, G. sicht,
   gesicht, Dan. sigte, Sw. sigt, from the root of E. see. See
   {See}, v. t.]
   1. The act of seeing; perception of objects by the eye; view;
      as, to gain sight of land.
            A cloud received him out of their sight. --Acts. i.
                                                  9.
   2. The power of seeing; the faculty of vision, or of
      perceiving objects by the instrumentality of the eyes.
            Thy sight is young, And thou shalt read when mine
            begin to dazzle.                      --Shak.
            O loss of sight, of thee I most complain! --Milton.
   3. The state of admitting unobstructed vision; visibility;
      open view; region which the eye at one time surveys; space
      through which the power of vision extends; as, an object
      within sight.
   4. A spectacle; a view; a show; something worth seeing.
            Moses said, I will now turn aside and see this great
            sight, why the bush is not burnt.     --Ex. iii. 3.
            They never saw a sight so fair.       --Spenser.
   5. The instrument of seeing; the eye.
            Why cloud they not their sights?      --Shak.
   6. Inspection; examination; as, a letter intended for the
      sight of only one person.
   7. Mental view; opinion; judgment; as, in their sight it was
      harmless. --Wake.
            That which is highly esteemed among men is
            abomination in the sight of God.      --Luke xvi.
                                                  15.
   8. A small aperture through which objects are to be seen, and
      by which their direction is settled or ascertained; as,
      the sight of a quadrant.
            Thier eyes of fire sparking through sights of steel.
                                                  --Shak.
   9. A small piece of metal, fixed or movable, on the breech,
      muzzle, center, or trunnion of a gun, or on the breech and
      the muzzle of a rifle, pistol, etc., by means of which the
      eye is guided in aiming. --Farrow.
   10. In a drawing, picture, etc., that part of the surface, as
       of paper or canvas, which is within the frame or the
       border or margin. In a frame or the like, the open space,
       the opening.
   11. A great number, quantity, or sum; as, a sight of money.
       [Now colloquial]
   Note: Sight in this last sense was formerly employed in the
         best usage. ``A sight of lawyers.'' --Latimer.
               A wonder sight of flowers.         --Gower.
   {At sight}, as soon as seen, or presented to sight; as, a
      draft payable at sight: to read Greek at sight; to shoot a
      person at sight.
   {Front sight} (Firearms), the sight nearest the muzzle.
   {Open sight}. (Firearms)
       (a) A front sight through which the objects aimed at may
           be seen, in distinction from one that hides the
           object.
       (b) A rear sight having an open notch instead of an
           aperture.
   {Peep sight}, {Rear sight}. See under {Peep}, and {Rear}.
   {Sight draft}, an order, or bill of exchange, directing the
      payment of money at sight.
   {To take sight}, to take aim; to look for the purpose of
      directing a piece of artillery, or the like.
   Syn: Vision; view; show; spectacle; representation;
        exhibition.
   

2. \Sight\, v. t. [imp. & p. p. {Sighted}; p. pr. & vb. n.
   {Sighting}.]
   1. To get sight of; to see; as, to sight land; to sight a
      wreck. --Kane.
   2. To look at through a sight; to see accurately; as, to
      sight an object, as a star.
   3. To apply sights to; to adjust the sights of; also, to give
      the proper elevation and direction to by means of a sight;
      as, to sight a rifle or a cannon.
   

3. \Sight\, v. i. (Mil.)
   To take aim by a sight.