Source : Webster's Revised Unabridged Dictionary (1913)

Agglutination \Ag*glu`ti*na"tion\, n. [Cf. F. agglutination.]
   1. The act of uniting by glue or other tenacious substance;
      the state of being thus united; adhesion of parts.

   2. (Physiol.) Combination in which root words are united with
      little or no change of form or loss of meaning. See
      {Agglutinative}, 2.

Source : WordNet®

agglutination
     n 1: a clumping of bacteria or red cells when held together by
          antibodies (agglutinins)
     2: the building of words from component morphemes that retain
        their form and meaning in the process of combining
     3: the coalescing of small particles that are suspended in
        solution; these larger masses are then (usually)
        precipitated [syn: {agglutinating activity}]