DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   hub
       n 1: the central part of a car wheel (or fan or propeller etc)
            through which the shaft or axle passes
       2: a center of activity or interest or commerce or
          transportation; a focal point around which events revolve;
          "the playground is the hub of parental supervision"; "the
          airport is the economic hub of the area"