noun (n)

• several things grouped together or considered as a whole(noun.group)

  Synonym:
  accumulation, assemblage, collection
  

  source: wordnet30
• the act of gathering something together(noun.act)

  Synonym:
  assembling, collecting, collection
  

  source: wordnet30
• The act of aggregating, or the state of being aggregated; collection into a mass or sum; a collection of particulars; an aggregate.(noun)

  source: webster1913