Sector Part Area Noun Circle Subdivision Military Verb

sec·tor

I

\\ˈsek-tər, -ˌtȯr\\ noun1.
  a. a geometric figure bounded by two radii and the included arc of a circle
  b.
    (1) a subdivision of a defensive military position
    (2) a portion of a military front or area of operation
  c. 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
• sec·tor·al \\ˈsek-t(ə-)rəl\\ adjective

II

\\-tər\\ transitive verb
(sec·tored ; sec·tor·ing \\-t(ə-)riŋ\\) : to divide into or furnish with sectors

sector
  1570, "section of a circle between two radii," from L.L. sector "section of a circle," from L. sector "a cutter," from sectus, pp. of secare "to cut" (see section). Translated Gk. tomeus in L. 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.

☞ sector
sec·tor / 5sektE(r) / noun1. a part of an area of activity, especially of a country's economy
   (尤指一国经济的)部门,领域,行业:
   the manufacturing sector
   制造业
   service-sector jobs (= in hotels, restaurants, etc.)
   服务性行业的工作
⇨ see also

private sector

,

public sector

2. a part of a particular area, especially an area under military control
   (尤指军事管制的)区域,地带:
   each sector of the war zone
   战区的每个军控地段
3. (geometry 几何) a part of a circle lying between ten straight lines drawn from the centre to the edge
   扇形

sector noun

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sec·tor
I. \ˈsektə(r) also -ˌtȯ(ə)r or -ȯ(ə)\ noun
(-s)
Etymology: Late Latin (translation of Greek tomeus), from Latin, cutter, from sectus (past participle of secare to cut) + -or — more at
1.
 a. : the geometrical figure bounded by two radii and the included arc of a circle
 b.
  (1) : a subdivision of a defensive military position assigned to a commander as an area of responsibility, bounded by arbitrary lines on the sides and rear, and in front extending to the maximum range of the weapons of the garrison — compare
  (2) : a portion of a front in military operations
 c. : something (as an area or a portion or part of something) resembling or held to resemble a sector : , ,
  < the Soviet sector of Berlin >
  < a reforested sector of cutover land — American Guide Series: Oregon >
 d. : a sociological, economic, or political subdivision of society
  < maintenance of public order is primarily the responsibility of the public sector — Kerner Report >
2. : a mathematical instrument consisting of two rulers connected at one end by a joint and marked with several scales (as of equal parts chords, sines, or tangents)
3.
 a. : an astronomical instrument whose limb embraces only a part of a circle and which is used for measuring angles too great for the compass of a micrometer
 b. : an arc-shaped attachment to an equatorial mounting often used for communicating slow-motion control of the driving clock to the polar axis
4. : a part of an apparatus whose principal kinematic lines form a sector
 < an index sector >
Synonyms: see
II. \-tə(r)\ verb
(sectored ; sectored ; sectoring \-t(ə)riŋ\ ; sectors)
transitive verb
: to divide into or furnish with sectors
intransitive verb
: to form colonies made up of visibly different sectors — used chiefly of bacteria and fungi that form mutant strains early in the colony history
III. noun

: a subdivision of a track on a computer disk