Source : Webster's Revised Unabridged Dictionary (1913)

Loop \Loop\, n. [G. luppe an iron lump. Cf. {Looping}.] (Iron
   Works)
   A mass of iron in a pasty condition gathered into a ball for
   the tilt hammer or rolls. [Written also {loup}.]

Loop \Loop\, n. [Cf. Ir. & Gael. lub loop, noose, fold, thong,
   bend, lub to bend, incline.]
   1. A fold or doubling of a thread, cord, rope, etc., through
      which another thread, cord, etc., can be passed, or which
      a hook can be hooked into; an eye, as of metal; a staple;
      a noose; a bight.

            That the probation bear no hinge, nor loop To hang a
            doubt on.                             --Shak.

   2. A small, narrow opening; a loophole.

            And stop all sight-holes, every loop from whence The
            eye of Reason may pry in upon us.     --Shak.

   3. A curve of any kind in the form of a loop.

   4. (Telegraphy) A wire forming part of a main circuit and
      returning to the point from which it starts.

   5. (Acoustics) The portion of a vibrating string, air column,
      etc., between two nodes; -- called also {ventral segment}.

   {Loop knot}, a single knot tied in a doubled cord, etc. so as
      to leave a loop beyond the knot. See Illust. of {Knot}.

Loop \Loop\, v. t. [imp. & p. p. {Looped}; p. pr. & vb. n.
   {Looping}.]
   To make a loop of or in; to fasten with a loop or loops; --
   often with up; as, to loop a string; to loop up a curtain.

Source : WordNet®

loop
     v 1: move in loops; "The bicycle looped around the tree"
     2: make a loop in; "loop a rope" [syn: {intertwine}]
     3: fly loops, perform a loop; "the stunt pilot looped his
        plane"
     4: wind around something in coils or loops [syn: {coil}, {curl}]
        [ant: {uncoil}]
     5: fasten or join with a loop; "He looped the watch through his
        belt"

loop
     n 1: fastener consisting of a metal ring for lining a small hole
          to permit the attachment of cords or lines [syn: {cringle},
           {eyelet}, {grommet}, {grummet}]
     2: anything with a round or oval shape (formed by a curve that
        is closed and does not intersect itself)
     3: (computer science) a single execution of a set of
        instructions that are to be repeated; "the solution took
        hundreds of iterations" [syn: {iteration}]
     4: an inner circle of advisors (especially under President
        Reagan); "he's no longer in the loop"
     5: the basic pattern of the human fingerprint
     6: a computer program that performs a series of instructions
        repeatedly until some specified condition is satisfied
     7: the topology of a network whose components are connected in
        a loop [syn: {loop topology}]
     8: an intrauterine device in the shape of a loop
     9: a complete electrical circuit around which current flows or
        a signal circulates [syn: {closed circuit}] [ant: {open
        circuit}]
     10: a flight maneuver; aircraft flies a complete circle in the
         vertical plane [syn: {loop-the-loop}]

Source : Free On-Line Dictionary of Computing

loop
     
         A sequence of {instructions} that the
        {processor} repeats, either until some condition is met, or
        indefinitely.
     
        In an {structured language} (e.g. {C}, {Pascal}, {BASIC}, or
        {Fortran}), a loop is usually achieved with {for loop}, {while
        loop} or {repeat loop} constructs.
     
        In other languages these constructs may be synthesised with a
        {jump} ({assembly language}) or a {GOTO} (early Fortran or
        BASIC).
     
        (1999-05-06)