aggregation


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Related to aggregation: data aggregation

aggregation

 [ag″rĕ-ga´shun]
1. massing or clumping of materials together.
2. a clumped mass of material.
familial aggregation the occurrence of more cases of a given disorder in close relatives of a person with the disorder than in control families.
platelet aggregation platelet agglutination.

ag·gre·ga·tion

(ag-rĕ-gā'shŭn),
A crowded mass of independent but similar units; a cluster.
Synonym(s): agglomeration

aggregation

/ag·gre·ga·tion/ (ag″rĕ-ga´shun)
1. massing or clumping of materials or people together.
2. a clumped mass of material.

familial aggregation  the occurrence of more cases of a given disorder in close relatives of a person with the disorder than in control families.
platelet aggregation  a clumping together of platelets induced by various agents (e.g., thrombin) as part of the mechanism leading to thrombus formation.

aggregation

[ag′rəgā′shən]
Etymology: L, ad + gregare, to gather together
an accumulation of substances, objects, or individuals, as in the clumping of blood cells or the clustering of clients with the same disorder. aggregate, v.

Aggregation

Epidemiology A term of art referring to a lopsided distribution of parasites among hosts, with some hosts suffering a greater infestation than would be expected by chance alone.
Vox populi A massing of material; clumping.

ag·gre·ga·tion

(ag'rĕ-gā'shŭn)
A crowded mass of independent but similar units; a cluster.

aggregation

a clumping or clustering of individuals of a population in a non-random distribution. Such clumping can occur
  1. as a response to local habitat differences, e.g. some organisms preferring, say, damp to dry areas;
  2. as a response to daily or seasonal weather changes;
  3. by reproductive processes, e.g. individuals hatching from the same egg batch in some animals, or poor seed dispersal in plants;
  4. as a result of social attraction, e.g. colonial nesting in birds.

Aggregation

The blood cell clumping process that is measured in the platelet aggregation test.

aggregation

1. massing or clumping of materials together.
2. a clumped mass of material.

familial aggregation
the occurrence of more cases of a given disorder in close relatives of an animal with the disorder than in control families.
platelet aggregation
platelet agglutination.
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1996), all of certain real property parcels were included in the decedent's estate; therefore, the Service's aggregation position did not depend on the family attribution argument.