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'Quadrant' may refer to:

★ One of the four sections of the Cartesian coordinate system

★ A ''measuring instrument'' similar to a sextant

★ In science-fiction: Galactic quadrants (Star Trek)

★ HMS Quadrant (G11), a Second World War British/Australian warship

★ A Quadrant or section in a city street nomenclature system

★ Quadrant (automobile)

★ Quadrant Homes a real-estate company in the northwestern US

★ Quadrant (magazine), an Australian journal

★ Quadrant Shopping Centre, Swansea, Wales

★ Quebec Conference (codenamed "QUADRANT")

★ A sector equal to one quarter of a circle, or half a semicircle