Alternative spelling of circular sector

(computing) A dedicated sector, usually at the beginning (first sector on first track) of a storage medium, that holds special data used to start a system.

An instrument used for measuring the dip of the horizon.

The economic sector consisting of non-governmental nonprofits.

(economics) The branch of a country's economy where high-level decisions are made by top-level executives in government, industry, education, etc.

(geometry) A portion of a circle enclosed by two radii and an arc.

Used other than figuratively or idiomatically: see married, sector.

(astrophysics, cosmology, astronomy, physics) The unknown portion of the Universe outside standard physics, including dark matter and dark energy.

plural of minimum sector altitude

(aviation) The lowest altitude which will provide a minimum clearance of 1000 ft (300 m) above all objects located in an area within a circular sector having a radius of 25 nautical miles (46 km) around a radio navigational aid.