The Collaborative International Dictionary of English v.0.48:

Coop \Coop\ (k[=oo]p), n. [Cf. AS. cypa a measure, D. kuip tub,
   Icel. kupa bowl, G. kufe coop tub; all fr. L. cupa vat, tub,
   LL. cupa, copa, cup. See Cup, and cf. Keeve.]
   [1913 Webster]
   1. A barrel or cask for liquor. [Obs.] --Johnson.
      [1913 Webster]

   2. An inclosure for keeping small animals; a pen; especially,
      a grated box for confining poultry.
      [1913 Webster]

   3. A cart made close with boards; a tumbrel. [Scotch]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coop \Coop\, v. t. [imp. & p. p. Cooped; p. pr. & vb. n.
   Cooping.]
   To confine in a coop; hence, to shut up or confine in a
   narrow compass; to cramp; -- usually followed by up,
   sometimes by in.
   [1913 Webster]

         The Trojans cooped within their walls so long.
                                                  --Dryden.
   [1913 Webster]

         The contempt of all other knowledge . . . coops the
         understanding up within narrow bounds.   --Locke.
   [1913 Webster]

   2. To work upon in the manner of a cooper. [Obs.] "Shaken
      tubs . . . be new cooped." --Holland.

   Syn: To crowd; confine; imprison.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

co-op \co"-op\ (k[=o]"[o^]p), n. [ contraction of co-operative
   enterprise.]
   a commercial enterprise run for the benefit of its owners.

   Syn: cooperative, coop.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

coop
    n 1: a farm building for housing poultry [syn: chicken coop,
         coop, hencoop, henhouse]
    2: an enclosure made or wire or metal bars in which birds or
       animals can be kept [syn: cage, coop]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "coop":
   arena, bar, beleaguer, beset, besiege, block, blockade, bottle up,
   bound, box in, box up, brooder, cage, calaboose, can, chamber,
   check, chicken house, chokey, cincture, clink, cloister, close,
   close in, compass, confine, constrain, contain, container, cooler,
   coop in, coop up, cordon, cordon off, cork up, corral, court,
   courtyard, crib, curtilage, delimited field, detain, encage,
   encircle, enclave, enclose, enclosure, encompass, enshrine,
   envelop, fence, fence in, field, fold, ground, hedge in, hell, hem,
   hem in, hencote, henhouse, hennery, hinder, hold, hold in custody,
   hold in restraint, hoosegow, house in, immure, impede, impound,
   imprison, incarcerate, include, inhibit, jail, jug, keep in,
   keep in custody, keep in detention, kennel, leaguer, limbo, list,
   lockup, mew, mew up, obstruct, pale, paling, park, pen, pen in,
   pen up, penfold, pinfold, place of confinement, pocket, pokey,
   pound, prison, purgatory, quad, quadrangle, quarantine, quod,
   rail in, restrain, restrict, seal up, shackle, shrine, shut in,
   shut up, slammer, square, stable, stir, surround, theater, toft,
   wall, wall in, wrap, yard, yard up



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COOP
       Concurrent Object Orientated Programming (OOP)