Aggregation

noun

1. The act of collecting or the state of being collected into an unorganized whole.
2. In logic, the union of species to form a genus, or of terms to form a term true of anything of which any of its parts are true, and only false when all its parts are false.
3. The adding of any one to an association as a member thereof; affiliation.
4. A combined whole; an aggregate.
5. In botany, applied by Darwin specifically to the peculiar change induced in the cells of the tentacles of Drosera by mechanical or chemical stimulation.