The Collaborative International Dictionary of English v.0.48:

Aggregator \Ag"gre*ga`tor\, n.
   One who aggregates.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aggregator
    n 1: a person who collects things [syn: collector,
         aggregator]

The Free On-line Dictionary of Computing (30 December 2018):

aggregator

    A program for watching for new content at
   user-specified RSS feeds.

   An example is BottomFeeder.


(http://directory.google.com/Top/Reference/Libraries/Library_and_Information_Science/Technical_Services/Cataloguing/Metadata/RDF/Applications/RSS/News_Readers/).

   (2003-09-29)