WordReference Random House Unabridged Dictionary of American English © 2017
ag•gre•ga•tion  (ag′ri gāshən),USA pronunciation n. 
  1. a group or mass of distinct or varied things, persons, etc.:an aggregation of complainants.
  2. collection into an unorganized whole.
  3. the state of being so collected.
  4. Ecology[Biol., Ecol.]a group of organisms of the same or different species living closely together but less integrated than a society.
ag′gre•gation•al, adj. 
  • Medieval Latin aggregātiōn- (stem of aggregātiō); see aggregate, -ion
  • 1540–50

Collins Concise English Dictionary © HarperCollins Publishers::

ˌaggreˈgation /ˌæɡrɪˈɡeɪʃən/ n
  1. the act or process of aggregating
  2. dispersion in which the individuals of a species are closer together than if they were randomly dispersed

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