Source : Webster's Revised Unabridged Dictionary (1913)

Cap \Cap\, n. [OE. cappe, AS. c[ae]ppe, cap, cape, hood, fr. LL,
   cappa, capa; perhaps of Iberian origin, as Isidorus of
   Seville mentions it first: ``Capa, quia quasi totum capiat
   hominem; it. capitis ornamentum.'' See 3d {Cape}, and cf. 1st
   {Cope}.]
   1. A covering for the head; esp.
      (a) One usually with a visor but without a brim, for men
          and boys;
      (b) One of lace, muslin, etc., for women, or infants;
      (c) One used as the mark or ensign of some rank, office,
          or dignity, as that of a cardinal.

   2. The top, or uppermost part; the chief.

            Thou art the cap of all the fools alive. --Shak.

   3. A respectful uncovering of the head.

            He that will give a cap and make a leg in thanks.
                                                  --Fuller.

   4. (Zo["o]l.) The whole top of the head of a bird from the
      base of the bill to the nape of the neck.

   5. Anything resembling a cap in form, position, or use; as:
      (a) (Arch.) The uppermost of any assemblage of parts; as,
          the cap of column, door, etc.; a capital, coping,
          cornice, lintel, or plate.
      (b) Something covering the top or end of a thing for
          protection or ornament.
      (c) (Naut.) A collar of iron or wood used in joining
          spars, as the mast and the topmast, the bowsprit and
          the jib boom; also, a covering of tarred canvas at the
          end of a rope.
      (d) A percussion cap. See under {Percussion}.
      (e) (Mech.) The removable cover of a journal box.
      (f) (Geom.) A portion of a spherical or other convex
          surface.

   6. A large size of writing paper; as, flat cap; foolscap;
      legal cap.

   {Cap of a cannon}, a piece of lead laid over the vent to keep
      the priming dry; -- now called an apron.

   {Cap in hand}, obsequiously; submissively.

   {Cap of liberty}. See {Liberty cap}, under {Liberty}.

   {Cap of maintenance}, a cap of state carried before the kings
      of England at the coronation. It is also carried before
      the mayors of some cities.

   {Cap money}, money collected in a cap for the huntsman at the
      death of the fox.

   {Cap paper}.
      (a) A kind of writing paper including flat cap, foolscap,
          and legal cap.
      (b) A coarse wrapping paper used for making caps to hold
          commodities.

   {Cap rock} (Mining), The layer of rock next overlying ore,
      generally of barren vein material.

   {Flat cap}, cap See {Foolscap}.

   {Forage cap}, the cloth undress head covering of an officer
      of soldier.

   {Legal cap}, a kind of folio writing paper, made for the use
      of lawyers, in long narrow sheets which have the fold at
      the top or ``narrow edge.''

   {To set one's cap}, to make a fool of one. (Obs.) --Chaucer.

   {To set one's cap for}, to try to win the favor of a man with
      a view to marriage. [Colloq.]

Cap \Cap\, v. i.
   To uncover the head respectfully. --Shak.

Cap \Cap\, v. t. [imp. & p. p. {Capped}; p. pr. & vb. n.
   {Capping}.]
   1. To cover with a cap, or as with a cap; to provide with a
      cap or cover; to cover the top or end of; to place a cap
      upon the proper part of; as, to cap a post; to cap a gun.

            The bones next the joint are capped with a smooth
            cartilaginous substance.              --Derham.

   2. To deprive of cap. [Obs.] --Spenser.

   3. To complete; to crown; to bring to the highest point or
      consummation; as, to cap the climax of absurdity.

   4. To salute by removing the cap. [Slang. Eng.]

            Tom . . . capped the proctor with the profoundest of
            bows.                                 --Thackeray.

   5. To match; to mate in contest; to furnish a complement to;
      as, to cap text; to cap proverbs. --Shak.

            Now I have him under girdle I'll cap verses with him
            to the end of the chapter.            --Dryden.

   Note: In capping verses, when one quotes a verse another must
         cap it by quoting one beginning with the last letter of
         the first letter, or with the first letter of the last
         word, or ending with a rhyming word, or by applying any
         other arbitrary rule may be agreed upon.

Source : WordNet®

cap
     n 1: a tight-fitting headdress
     2: a top (as for a bottle)
     3: a mechanical or electrical explosive device or a small
        amount of explosive; can be used to initiate the reaction
        of a disrupting explosive [syn: {detonator}, {detonating
        device}]
     4: something serving as a cover or protection
     5: a fruiting structure resembling an umbrella that forms the
        top of a stalked fleshy fungus such as a mushroom [syn: {pileus}]
     6: an upper limit on what is allowed; "they established a cap
        for prices" [syn: {ceiling}]
     7: dental appliance consisting of an artificial crown for a
        tooth [syn: {crownwork}]
     8: the upper part of a column that supports the entablature
        [syn: {capital}, {chapiter}]
     [also: {capping}, {capped}]

cap
     v 1: lie at the top of; "Snow capped the mountains" [syn: {crest}]
     2: restrict the number or amount of; "We had to cap the number
        of people we can accept into our club"
     [also: {capping}, {capped}]

Source : Free On-Line Dictionary of Computing

CAP
     
        1.  {Columbia AppleTalk Package}.
     
        2.  {Carrierless Amplitude/Phase Modulation}.
     
        3.  {Competitive Access Provider}