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]

WordNet (r) 3.0 (2006):

condensing
    n 1: the act of increasing the density of something [syn:
         condensing, condensation]