sector (
http://definr.com/sector)
n 1: a plane figure bounded by two radii and the included arc of
a circle
2: a body of people who form part of society or economy; "the
public sector"
3: a particular aspect of life or activity; "he was helpless in
an important sector of his life" [syn:
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