DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   sector
       n 1: a plane figure bounded by two radii and the included arc of
            a circle
       2: a social group that forms part of the society or the economy;
          "the public sector"
       3: a particular aspect of life or activity; "he was helpless in
          an important sector of his life" [syn: sector, sphere]
       4: the minimum track length that can be assigned to store
          information; unless otherwise specified a sector of data
          consists of 512 bytes
       5: a portion of a military position
       6: measuring instrument consisting of two graduated arms hinged
          at one end