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Webster 1913 Edition

Sector

Sec′tor

,
Noun.
[L., properly, a cutter, fr.
secare
,
sectum
, to cut: cf. F.
secteur
. See
Section
.]
1.
(Geom.)
A part of a circle comprehended between two radii and the included arc.
2.
A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc., one scale of each kind on each arm, and all on lines radiating from the common center of motion. The sector is used for plotting, etc., to any scale.
3.
An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector.
Dip sector
,
an instrument used for measuring the dip of the horizon.
–
Sector of a sphere
, or
Spherical sector
,
the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its vertex.

Webster 1828 Edition

Sector

SECT'OR

,
Noun.
[L. seco, to cut.]
1. In geometry, a part of a circle comprehended between two radii and the arch; or a mixed triangle, formed by two radii and the arch of a circle.
2. A mathematical instrument so marked with lines of sines, tangents, secants, chords, &c. as to fit all radii and scales, and useful in finding the proportion between quantities of the same kind. The sector is founded on the fourth proposition of the sixth book of Euclid, where it is proved that similar triangles have their homologous sides proportional.

Definition 2024

sector

sector

English

Noun

A geometric sector, to the left.

sector ‎(plural sectors)

  1. section
  2. zone (designated area).
  3. (geometry) part of a circle, extending to the center
  4. (computing) fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium (compare to block)
  5. (military) an area designated by boundaries within which a unit operates, and for which it is responsible
  6. (military) one of the subdivisions of a coastal frontier
  7. (science fiction) a fictional region of space designated for navigational or governance purposes.
  8. (calculation) an instrument consisting of two rulers of equal length joined by a hinge.
  9. a field of economic activity
    • 2013 June 28, Joris Luyendijk, “Our banks are out of control”, in The Guardian Weekly, volume 189, number 3, page 21:
      Seeing the British establishment struggle with the financial sector is like watching an alcoholic who still resists the idea that something drastic needs to happen for him to turn his life around. Until 2008 there was denial over what finance had become. When a series of bank failures made this impossible, there was widespread anger, leading to the public humiliation of symbolic figures.
    public sector;  private sector‎

Derived terms

Related terms

Translations

See also

Anagrams

Catalan

Noun

sector m ‎(plural sectors)

  1. sector

Latin

Etymology 1

From secō ‎(“cut, cut off”) +‎ -tor.

Noun

sector m ‎(genitive sectōris); third declension

  1. One who cuts or cuts off, cutter.
  2. A purchaser or bidder at a sale of confiscated goods. (feminine: sectrix)
Inflection

Third declension.

Case Singular Plural
nominative sector sectōrēs
genitive sectōris sectōrum
dative sectōrī sectōribus
accusative sectōrem sectōrēs
ablative sectōre sectōribus
vocative sector sectōrēs
Descendants

Etymology 2

From sequor ‎(“follow”) +‎ -tō.

Verb

sector ‎(present infinitive sectārī, perfect active sectātus sum); first conjugation, deponent

  1. I follow continually, attend, accompany.
  2. I follow after, pursue, chase.
  3. I seek after/out
Inflection
   Conjugation of sector (first conjugation, deponent)
indicative singular plural
first second third first second third
active present sector sectāris, sectāre sectātur sectāmur sectāminī sectantur
imperfect sectābar sectābāris, sectābāre sectābātur sectābāmur sectābāminī sectābantur
future sectābor sectāberis, sectābere sectābitur sectābimur sectābiminī sectābuntur
perfect sectātus + present active indicative of sum
pluperfect sectātus + imperfect active indicative of sum
future perfect sectātus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present secter sectēris, sectēre sectētur sectēmur sectēminī sectentur
imperfect sectārer sectārēris, sectārēre sectārētur sectārēmur sectārēminī sectārentur
perfect sectātus + present active subjunctive of sum
pluperfect sectātus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present — sectāre — — sectāminī —
future — sectātor sectātor — — sectantor
non-finite forms active passive
present perfect future present perfect future
infinitives sectārī sectātus esse sectātūrus esse — — —
participles sectāns sectātus sectātūrus — — sectandus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
sectārī sectandī sectandō sectandum sectātum sectātū

References

Portuguese

Pronunciation

  • (Portugal) IPA(key): /sɛk.ˈtoɾ/
  • Hyphenation: sec‧tor

Noun

sector m (plural sectores)

  1. Alternative form of setor

Spanish

Noun

sector m ‎(plural sectores)

  1. section.
  2. zone.
  3. branch.

Pronunciation

  • (US) IPA(key): /ˈsɛk.tər/

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