Webster's Revised Unabridged Dictionary · 1913

Aggregation

Aggregation ({not transcribed}) , noun

[Compare Late Latin aggregatio, French agrégation.]

The act of aggregating, or the state of being aggregated; collection into a mass or sum; a collection of particulars; an aggregate.
Each genus is made up by aggregation of species. — Carpenter
A nation is not an idea only of local extent and individual momentary aggregation, but... of continuity, which extends in time as well as in numbers, and in space. — Burke