DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   grouping
       n 1: any number of entities (members) considered as a unit [syn:
            group, grouping]
       2: the activity of putting things together in groups
       3: a system for classifying things into groups [syn: grouping,
          pigeonholing]