# sector

Pronunciation: US say "SEK-tur" /ˈsɛk.təɹ/; UK say "SEK-tuh" /ˈsɛktə(r)/

## Noun

1. A field of economic activity, grouping together businesses and organizations of one kind.
   - Simple: A part of a country's economy that covers one kind of business or activity.
   - _The public sector employs millions of workers across the country._
   - _Investors shifted money into the energy sector after the announcement._
2. A distinct part of a larger area or thing, especially one marked off from the rest, such as a zone of a city, a stadium or, in science fiction, of space.
   - Simple: One part of a bigger area or thing, often with clear edges, like one section of a city or stadium.
   - _Each sector of the warehouse was assigned to a different team._
   - _The stadium was split into numbered sectors for crowd control._
3. An area that a military unit is responsible for defending or operating in, marked by fixed boundaries, including a division of a coastal frontier.
   - Simple: The area that a group of soldiers is given to control or defend.
   - _The battalion held its sector against repeated attacks._
   - _Commanders divided the front into sectors, each with its own orders._
4. A region of a circle bounded by two radii and the arc between their endpoints.
   - Simple: A pie-slice shape made by two lines from the center of a circle and the curve between them.
   - _The student calculated the area of the shaded sector._
   - _Each sector of the pie chart represented a different expense._
5. A fixed-size unit of data, traditionally 512 bytes, stored in sequence on a track of a disk or other digital medium.
   - Simple: A small, fixed-size block of data stored on one track of a disk.
   - _The repair tool scanned the drive for damaged sectors._
   - _Each sector on the disk holds the same number of bytes._
6. A fixed, continuous section of a racetrack, where the parts do not overlap but together make up the whole lap.
   - Simple: One fixed part of a race track, with all the parts together making up the full lap.
   - _The driver gained two tenths in the final sector._
   - _Telemetry showed strong pace across all three sectors._
7. A portion of a sphere or solid ball bounded by a cone whose apex lies at the center.
   - Simple: A part of a ball shaped like a cone, with its tip at the center.
   - _The diagram highlighted a single sector of the sphere._
   - _To find the volume of a spherical sector, multiply two-thirds of pi by the square of the radius and by the height of its cap._

## Other meanings

- (noun) A part of a crag that contains a group of climbing routes.
- (noun) A toothed gear whose working face forms the arc of a circle rather than a full ring.
- (noun) A calculating instrument made of two equal-length rulers joined by a hinge.
- (noun) A smaller community or subculture belonging to the wider world of micronations.

## Origin

Borrowed from the Latin word "sector".

Source: DictionaryAI, https://dictionaryai.com/define/sector (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).