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the act or process 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.
Immunology. the clumping of bacteria, red blood cells, or other cells, due to the introduction of an antibody.
Linguistics. a process of word formation in which morphemes, each having one relatively constant shape, are combined without fusion or morphophonemic change, and in which each grammatical category is typically represented by a single morpheme in the resulting word, especially such a process involving the addition of one or more affixes to a base, as in Turkish, in which ev means “house,” ev-den means “from a house,” and ev-ler-den means “from houses.”.
Historical Examples

agglutination or aggregation is carried to its widest extent, and words of inordinate length are not uncommon.
The Works of Hubert Howe Bancroft, Volume 3 Hubert Howe Bancroft

They must combine with the foreign cells and also bring about their clumping together, their agglutination.
The Fundamentals of Bacteriology Charles Bradfield Morrey

The serum of certain humans may cause the destruction or agglutination of blood corpuscles of certain other humans.
The Organism as a Whole Jacques Loeb

Except in this single matter of agglutination reaction, no constant distinction between these varieties has been demonstrated.
Food Poisoning Edwin Oakes Jordan

This “agglutination” takes place even when the blood is greatly diluted.
A Manual of Clinical Diagnosis James Campbell Todd

The presence of bivalent cations, especially Ca, also favours the agglutination.
The Organism as a Whole Jacques Loeb

Accretion by chemical precipitations, by welding, by pressure, by agglutination.
Zoonomia, Vol. I Erasmus Darwin

The melting, agglutination, and refining of the metal to fit it for the heavy hammers where it gets nerve.
A Dictionary of Arts, Manufactures and Mines Andrew Ure

Having utilized the technic devised by Teague, I have had no difficulty in performing the agglutination test in plague.
Plague Thomas Wright Jackson

Test the vibrio isolated against the serum of an animal immunised to the Vibrio choleræ for agglutination.
The Elements of Bacteriological Technique John William Henry Eyre

noun
the act or process of agglutinating
the condition of being agglutinated; adhesion
a united mass or group of parts
(chem) the formation of clumps of particles in a suspension
(biochem) proteinaceous particles, such as blood cells and bacteria, that form clumps in antibody–antigen reactions
(immunol) the formation of a mass of particles, such as erythrocytes, by the action of antibodies
(linguistics) the building up of words from component morphemes in such a way that these undergo little or no change of form or meaning in the process of combination
n.

1540s, from Latin agglutinationem (nominative agglutinatio), noun of action from past participle stem of agglutinare “fasten with glue,” from ad- “to” (see ad-) + glutinare “to glue,” from gluten “glue,” from PIE *glei- (see glue (n.)). Philological sense first recorded 1650s, in agglutinative.

agglutination ag·glu·ti·na·tion (ə-glōōt’n-ā’shən)
n.

The act or process of agglutinating.

The clumping together of red blood cells or bacteria, usually in response to a particular antibody.

A clumped mass of material formed by agglutination. Also called agglutinate.

Adhesion of wound surfaces in healing.

agglutination
(ə-glt’n-ā’shən)
The clumping together of biologic material, such as red blood cells or bacteria, that is suspended in liquid, usually in response to a particular antibody.