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sector (n.)

1560s, "section of a circle between two radii," from Late Latin sector "section of a circle," in classical Latin "a cutter, one who cuts," from sectus, past participle of secare "to cut" (from PIE root *sek- "to cut"). Translated Greek tomeus in Latin editions of Archimedes. Meaning "area, division" appeared 1920, generalized from military sense (1916) of "part of a front," based on a circle centered on a headquarters. As a verb from 1884. Related: Sectoral; sectorial.

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Definitions of sector from WordNet

sector (n.)
a plane figure bounded by two radii and the included arc of a circle;
sector (n.)
a social group that forms part of the society or the economy;
the public sector
sector (n.)
a particular aspect of life or activity;
he was helpless in an important sector of his life
Synonyms: sphere
sector (n.)
the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes;
sector (n.)
a portion of a military position;
sector (n.)
measuring instrument consisting of two graduated arms hinged at one end;
From wordnet.princeton.edu