The Collaborative International Dictionary of English v.0.48:

Congelation \Con`ge*la"tion\, n. [F. cong['e]lation, L.
   congelatio.]
   1. The act or process of passing, or causing to pass, from a
      fluid to a solid state, as by the abstraction of heat; the
      act or process of freezing.
      [1913 Webster]

            The capillary tubes are obstructed either by outward
            compression or congelation of the fluid.
                                                  --Arbuthnot.
      [1913 Webster]

   2. The state of being congealed.
      [1913 Webster]

   3. That which is congealed.
      [1913 Webster]

            Sugar plums . . . with a multitude of congelations
            in jellies of various colors.         --Taller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

congelation
    n 1: the process of congealing; solidification by (or as if by)
         freezing [syn: congealment, congelation]