1. [n]  a flight maneuver; aircraft flies a complete circle in the vertical plane
2. [n]  a complete electrical circuit around which current flows or a signal circulates
3. [n]  fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines
4. [n]  an intrauterine device in the shape of a loop
5. [n]  a computer program that performs a series of instructions repeatedly until some specified condition is satisfied
6. [n]  the basic pattern of the human fingerprint
7. [n]  an inner circle of advisors (especially under President Reagan); "he's no longer in the loop"
8. [n]  (computer science) a single execution of a set of instructions that are to be repeated; "the solution took hundreds of iterations"
9. [n]  anything with a round or oval shape (formed by a line or cord etc.) that is closed or nearly closed
10. [v]  fasten with a loop
11. [v]  wind around something in coils or loops
12. [v]  make a loop in, as of rope or string
13. [v]  fly loops, perform a loop, as of an airplane
14. [v]  move in loops

Loop
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1. \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}.]
   

2. \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}.
   

3. \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.
   

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).

a knotted "eye" of cord, corresponding to the "taches" or knobs in the edges of the curtains of the tabernacle, for joining them into a continuous circuit, fifty to a curtain (Ex. 26:4, 5, 10, 11).