The Collaborative International Dictionary of English v.0.48:

Condense \Con*dense"\, v. i.
   1. To become more compact; to be reduced into a denser form.
      [1913 Webster]

            Nitrous acid is gaseous at ordinary temperatures,
            but condenses into a very volatile liquid at the
            zero of Fahrenheit.                   --H. Spencer.
      [1913 Webster]

   2. (Chem.)
      (a) To combine or unite (as two chemical substances) with
          or without separation of some unimportant side
          products.
      (b) To undergo polymerization.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Condense \Con*dense"\, v. t. [imp. & p. p. Condensed; p. pr. &
   vb. n. Condensing.] [L. condensare; con- + densare to make
   thick or dense, densus thick, dense: cf. F. condenser. See
   Dense, and cf. Condensate.]
   1. To make more close, compact, or dense; to compress or
      concentrate into a smaller compass; to consolidate; to
      abridge; to epitomize.
      [1913 Webster]

            In what shape they choose,
            Dilated or condensed, bright or obscure. --Milton.
      [1913 Webster]

            The secret course pursued at Brussels and at Madrid
            may be condensed into the usual formula,
            dissimulation, procrastination, and again
            dissimulation.                        --Motley.
      [1913 Webster]

   2. (Chem. & Physics) To reduce into another and denser form,
      as by cold or pressure; as, to condense gas into a liquid
      form, or steam into water.
      [1913 Webster]

   Condensed milk, milk reduced to the consistence of very
      thick cream by evaporation (usually with addition of
      sugar) for preservation and transportation.

   Condensing engine, a steam engine in which the steam is
      condensed after having exerted its force on the piston.

   Syn: To compress; contract; crowd; thicken; concentrate;
        abridge; epitomize; reduce.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Condense \Con*dense"\, a. [L. condensus.]
   Condensed; compact; dense. [R.]
   [1913 Webster]

         The huge condense bodies of planets.     --Bentley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

condense
    v 1: undergo condensation; change from a gaseous to a liquid
         state and fall in drops; "water condenses"; "The acid
         distills at a specific temperature" [syn: condense,
         distill, distil]
    2: make more concise; "condense the contents of a book into a
       summary" [syn: digest, condense, concentrate]
    3: remove water from; "condense the milk"
    4: cause a gas or vapor to change into a liquid; "The cold air
       condensed the steam"
    5: become more compact or concentrated; "Her feelings condensed"
    6: develop due to condensation; "All our planets condensed out
       of the same material"
    7: compress or concentrate; "Congress condensed the three-year
       plan into a six-month plan" [syn: condense, concentrate,
       contract]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "condense":
   abbreviate, abridge, abstract, accelerate, aggravate,
   be telegraphic, beef up, blow up, bob, boil down, brief, cake,
   candy, capsule, capsulize, circumscribe, clip, coarct, compact,
   complicate, compress, concentrate, concrete, congest, consolidate,
   constrict, constringe, contract, cram, cramp, crop, crowd,
   crystallize, curtail, cut, cut back, cut down, cut off short,
   cut short, decrease, deepen, densen, densify, digest, distill,
   dock, double, draw, draw in, draw together, dribble, drip, dripple,
   drop, elide, enhance, epitomize, exacerbate, exaggerate, filter,
   foreshorten, granulate, gurgle, heat up, heighten, hop up, hot up,
   intensify, inventory, jam, jazz up, key up, knit, leach, lixiviate,
   magnify, make complex, minimize, mow, narrow, nip, nutshell,
   outline, percolate, poll, pollard, press, prune, pucker, pucker up,
   purse, ram down, ramify, reap, recap, recapitulate, redouble,
   reduce, reinforce, retrench, seep, set, sharpen, shave, shear,
   shorten, shrink, sketch, sketch out, snub, solidify, soup up,
   spurtle, squeeze, step up, strangle, strangulate, strengthen,
   stunt, sum, sum up, summarize, summate, sweat, synopsize,
   take a set, take in, telescope, thicken, trickle, trim, triple,
   truncate, waste no words, weep, whet, wrinkle