"sector" in the noun sense
a plane figure bounded by two radii and the included arc of a circle
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"
the minimum track length that can be assigned to store information unless otherwise specified a sector of data consists of 512 bytes
a portion of a military position
measuring instrument consisting of two graduated arms hinged at one end
Source: WordNet® (An amazing lexical database of English)
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