Simple Definition of sector
: an area of an economy : a part of an economy that includes certain kinds of jobs
: an area for which someone (such as a military commander) is responsible
computers : one of the parts that a computer disk is divided into
Full Definition of sector
1a : a geometric figure bounded by two radii and the included arc of a circleb (1) : a subdivision of a defensive military position (2) : a portion of a military front or area of operationc : an area or portion resembling a sector <bilingual sector of town — David Kleinberg>d : a sociological, economic, or political subdivision of society <cooperation between the public and private sectors — Peter Chapman>
2 : a mathematical instrument consisting of two rulers connected at one end by a joint and marked with several scales
3 : a subdivision of a track on a computer disk
Examples of sector
He was assigned to the northern sector.
Data is stored on the disk in 512-byte sectors.
Origin of sector
Late Latin, from Latin, cutter, from secare to cut — more at saw
First Known Use: 1570
First Known Use of sector
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