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.

noun

aggregate , gathering , all , amassment , assemblage , collection , congeries , cumulation , mass , accumulation , assembly , association , cluster , combination , company , crowd , flock , gang , group , herd , nest , quantity