The Collaborative International Dictionary of English v.0.48:

Looping \Loop"ing\, n. [Cf. D. loopen to run. Cf. Loop a mass
   of iron, Leap.] (Metal.)
   The running together of the matter of an ore into a mass,
   when the ore is only heated for calcination.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Loop \Loop\ (l[=oo]p), v. t. [imp. & p. p. Looped (l[=oo]pt);
   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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Looping \Loop"ing\, p. pr. & vb. n.
   of Loop.
   [1913 Webster]

   Looping snail (Zool.), any species of land snail of the
      genus Truncatella; -- so called because it creeps like
      the measuring worms.
      [1913 Webster]

WordNet (r) 3.0 (2006):

looping
    n 1: (computer science) executing the same set of instructions a
         given number of times or until a specified result is
         obtained; "the solution is obtained by iteration" [syn:
         iteration, looping]