agglutination

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or process of agglutinating; adhesion of distinct parts.
• noun A clumped mass of material formed by agglutination.
• noun Physiology The clumping together of red blood cells or bacteria, usually in response to a particular antibody.
• noun Linguistics The formation of words from morphemes that retain their original forms and meanings with little change during the combination process.

from The Century Dictionary.

• noun The act of uniting by glue or other tenacious substance; the state of being thus united; adhesion of parts; that which is united; a mass or group cemented together.
• noun In philology, the condition of being agglutinate; the process or result of agglutinate combination. See agglutinate, a.
• noun In Wundt's psychology, the simplest type of apperceptive connection of ideas: a connection in which one is still clearly conscious of the constituent ideas, while the total idea aroused by their conjunction is nevertheless unitary: for example, watch-tower, steamboat.
• noun In bacteriology, the clumping or coalescence of red blood-corpuscles or bacteria brought about by the action of special agglutinating substances (agglutinins).

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of uniting by glue or other tenacious substance; the state of being thus united; adhesion of parts.
• noun (Physiol.) Combination in which root words are united with little or no change of form or loss of meaning. See Agglutinative, 2.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of uniting by glue or other tenacious substance; the state of being thus united; adhesion of parts.
• noun Combination in which root words are united with little or no change of form or loss of meaning. See agglutinative.
• noun The clumping together of red blood cells or bacteria, usually in response to a particular antibody.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a clumping of bacteria or red cells when held together by antibodies (agglutinins)
• noun the building of words from component morphemes that retain their form and meaning in the process of combining
• noun the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated