Etymology
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sector (n.)

1560s, in geometry, "a 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"). Sector translated Greek tomeus in Latin editions of Archimedes.

By 1715 of any figure having the shape of a sector; the meaning "area, division" (without regard to shape) is by 1920, perhaps generalized from a World War I military sense (1916) of "part of a front," based on a circle centered on a headquarters. The meaning "a branch of an economy" is by 1937. As a verb from 1884, "divide into sectors." Related: Sectored; sectoral; sectorial.

updated on March 25, 2022

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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, not affiliated with etymonline.