The Collaborative International Dictionary of English v.0.48:

Sight \Sight\ (s[imac]t), n. [OE. sight, si[thorn]t, siht, AS.
   siht, gesiht, gesih[eth], gesieh[eth], gesyh[eth]; 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.
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            A cloud received him out of their sight. --Acts. i.
                                                  9.
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   2. The power of seeing; the faculty of vision, or of
      perceiving objects by the instrumentality of the eyes.
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            Thy sight is young,
            And thou shalt read when mine begin to dazzle.
                                                  --Shak.
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            O loss of sight, of thee I most complain! --Milton.
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   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.
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   4. A spectacle; a view; a show; something worth seeing.
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            Moses said, I will now turn aside and see this great
            sight, why the bush is not burnt.     --Ex. iii. 3.
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            They never saw a sight so fair.       --Spenser.
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   5. The instrument of seeing; the eye.
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            Why cloud they not their sights?      --Shak.
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   6. Inspection; examination; as, a letter intended for the
      sight of only one person.
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   7. Mental view; opinion; judgment; as, in their sight it was
      harmless. --Wake.
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            That which is highly esteemed among men is
            abomination in the sight of God.      --Luke xvi.
                                                  15.
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   8. A small aperture or optical device through which objects
      are to be seen, and by which their direction is settled or
      ascertained; -- used on surveying instruments; as, the
      sight of a quadrant.
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            Thier eyes of fire sparking through sights of steel.
                                                  --Shak.
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   9. An optical device or 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. A
      telescope mounted on a weapon, such as a rifle, and used
      for accurate aiming at distant targets is called a
      telescopic sight. --Farrow.
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   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.
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   11. A great number, quantity, or sum; as, a sight of money.
       [Now colloquial]
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   Note: Sight in this last sense was formerly employed in the
         best usage. "A sight of lawyers." --Latimer.
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               A wonder sight of flowers.         --Gower.
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   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.
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   Syn: Vision; view; show; spectacle; representation;
        exhibition.
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The Collaborative International Dictionary of English v.0.48:

Rear \Rear\, a.
   Being behind, or in the hindmost part; hindmost; as, the rear
   rank of a company.
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   Rear admiral, an officer in the navy, next in rank below a
      vice admiral and above a commodore. See Admiral.

   Rear front (Mil.), the rear rank of a body of troops when
      faced about and standing in that position.

   Rear guard (Mil.), the division of an army that marches in
      the rear of the main body to protect it; -- used also
      figuratively.

   Rear line (Mil.), the line in the rear of an army.

   Rear rank (Mil.), the rank or line of a body of troops
      which is in the rear, or last in order.

   Rear sight (Firearms), the sight nearest the breech.

   To bring up the rear, to come last or behind.
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