Aggregation (noun)

1. The action or process of gathering together.
2. A thing that has been gathered together.
3. A group of things or people that have been gathered together.
4. A complex entity formed of many simpler ones.

Origin:

Late middle english: from latin aggregatio(n-), from aggregare "add to a flock" (see aggregate).

Examples:

1. The aggregation of stars forms a galaxy.
2. The aggregation of data is important for making informed decisions.
3. The aggregation of proteins forms a complex structure.
4. The aggregation of individual efforts can lead to great things.
5. The aggregation of cells forms tissues and organs.