1 a part of an area of activity, especially of a country's economy:
the manufacturing sector * service-sector jobs (= in hotels, restaurants, etc.)
seealsoTHEPRIVATESECTOR, THEPUBLICSECTOR
2 a part of a particular area, especially an area under military control:
each sector of the search / war zone
3 (geometry) a part of a circle lying between two straight lines drawn from the centre to the edge
