\Con`den*sa"tion\, n. [L. condensatio: cf. F.
condensation.]
1. The act or process of condensing or of being condensed;
   the state of being condensed.
         He [Goldsmith] was a great and perhaps an unequaled
         master of the arts of selection and condensation.
                                               --Macaulay.
2. (Physics) The act or process of reducing, by depression of
   temperature or increase of pressure, etc., to another and
   denser form, as gas to the condition of a liquid or steam
   to water.
3. (Chem.) A rearrangement or concentration of the different
   constituents of one or more substances into a distinct and
   definite compound of greater complexity and molecular
   weight, often resulting in an increase of density, as the
   condensation of oxygen into ozone, or of acetone into
   mesitylene.
{Condensation product} (Chem.), a substance obtained by the
   polymerization of one substance, or by the union of two or
   more, with or without separation of some unimportant side
   products.
{Surface condensation}, the system of condensing steam by
   contact with cold metallic surfaces, in distinction from
   condensation by the injection of cold water.