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

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.

(astronomy) Synonym of zenith telescope

(mathematics) An area on a plane bounded by two rays from the origin and a rectangular hyperbola.

A principle in international law where international boundaries are extended over sea areas in the Arctic towards the North Pole following meridians (lines of longitude). The same principle is used over land in the Antarctic to the South Pole.

(computing) Of a storage medium: divided up by hard sectoring.

(computing) The recording of layout data onto a magnetic or optical recording medium in order to designate the sector locations, as opposed to using physical marks or holes.

(computing) Of a storage medium: divided up by soft sectoring.

(computing) The use of a physical mark or hole to reference sector locations within a magnetic or optical recording medium.