Source : Webster's Revised Unabridged Dictionary (1913)

Aggregation \Ag`gre*ga"tion\, n. [Cf. LL. aggregatio, F.
   agr['e]gation.]
   The act of aggregating, or the state of being aggregated;
   collection into a mass or sum; a collection of particulars;
   an aggregate.

         Each genus is made up by aggregation of species.
                                                  --Carpenter.

         A nation is not an idea only of local extent and
         individual momentary aggregation, but . . . of
         continuity, which extends in time as well as in
         numbers, and in space.                   --Burke.

Source : WordNet®

aggregation
     n 1: several things grouped together or considered as a whole
          [syn: {collection}, {accumulation}, {assemblage}]
     2: the act of gathering something together [syn: {collection},
        {collecting}, {assembling}]

Source : Free On-Line Dictionary of Computing

aggregation
     
         A composition technique for building a new
        {object} from one or more existing objects that support some
        or all of the new object's required interfaces.
     
        (1996-01-07)