aggregation

Short definition from Wiktionary

Noun

1. 1
   The act of collecting together, of aggregating.
2. 2
   The state of being collected into a mass, assemblage, or (aggregated) sum.
3. 3
   A collection of particulars; an aggregate.
4. 4
   Summarizing multiple routes into one route.
5. 5
   The majority of the parasite population concentrated into a minority of the host population.
6. 6
   Kind of object composition which does not imply ownership.
7. 7
   A component of natural language generation that entails combining syntactic elements.