Pronunciation: (ag"ri-gā'shun), [key]
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. Biol., Ecol.a group of organisms of the same or different species living closely together but less integrated than a society.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.