The Collaborative International Dictionary of English v.0.48:

Aggregate \Ag"gre*gate\, n.
   1. A mass, assemblage, or sum of particulars; as, a house is
      an aggregate of stone, brick, timber, etc.
      [1913 Webster]

   Note: In an aggregate the particulars are less intimately
         mixed than in a compound.
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   2. (Physics) A mass formed by the union of homogeneous
      particles; -- in distinction from a compound, formed by
      the union of heterogeneous particles.
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   In the aggregate, collectively; together.
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