Webster's English Dictionary

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bloc

bloc \'bla:k\ n [F, lit., block] often attrib  1a: a temporary combination 
   of parties in a legislative assembly  1b: a group of legislators in a U.S. 
   legislative assembly who act together  for some common purpose irrespective 
   of party lines 2a: a combination of persons, groups, or nations forming a 
   unit with a comm on interest or purpose 2b: a group of nations united by 
   treaty or agreement for mutual support or  joint action