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