What does agglutination mean?
The definition of agglutination
Ag*glu`ti*na”tion, n.
Etym: [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.