(astrophysics, cosmology, astronomy, physics) The known universe; the part of the universe that is not part of the dark sector; the segment of the universe that is explained by the known laws of physics, and whose components (particles) are predicted by it. The portion of the universe that is not dark matter nor dark energy.

(computing) An addressing system of hard drives where the hard drive is addressed by its cylinders, heads, and sectors.

(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.

plural of minimum sector altitude

(economics) A model in development economics that explains the growth of a developing economy in terms of a labour transition between the capitalist sector and the subsistence sector.

Alternative form of quaternary industry