c.1400, from Latin aggregatus "associated," literally "united in a flock," past participle of aggregare "add to (a flock), lead to a flock, bring together (in a flock)," from ad- "to" (see ad-) + gregare "herd" (see gregarious).

c.1400, from Latin aggregatum, neuter past participle of aggregare (see aggregate, adj.). Related: Aggregated; aggregating.

"number of persons, things, etc., regarded as a unit," early 15c., from noun use of Latin adjective aggregatum, neuter of aggregatus (see aggregate, adj.).