[ ag-ri-gey-shuh n ]
/ ˌæg rɪˈgeɪ ʃən /


a group or mass of distinct or varied things, persons, etc.: an aggregation of complainants.
collection into an unorganized whole.
the state of being so collected.
Biology, Ecology. a group of organisms of the same or different species living closely together but less integrated than a society.


Nearby words

  1. aggregate,
  2. aggregate fruit,
  3. aggregate glands,
  4. aggregated lymphatic follicles,
  5. aggregately,
  6. aggregative,
  7. aggregator,
  8. aggregatory,
  9. aggress,
  10. aggression

Origin of aggregation

1540–50; < Medieval Latin aggregātiōn- (stem of aggregātiō); see aggregate, -ion

Related formsag·gre·ga·tion·al, adjectivere·ag·gre·ga·tion, nounsub·ag·gre·ga·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for aggregation

British Dictionary definitions for aggregation


/ (ˌæɡrɪˈɡeɪʃən) /


the act or process of aggregating
ecology dispersion in which the individuals of a species are closer together than if they were randomly dispersed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for aggregation



early 15c., from Middle French agrégation or directly from Medieval Latin aggregationem (nominative aggregatio), noun of action from past participle stem of Latin aggregare (see aggregate (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for aggregation


[ ăg′rĭ-gāshən ]


A massing together or clustering of independent but similar units, such as particles, parts, or bodies.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.