Quadrant

One of the four sections of the Cartesian coordinate system
Quadrant (instrument) A measuring instrument capable of measuring angles up to 90°
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
First Quebec Conference (1943) (codenamed "QUADRANT")
A sector equal to one quarter of a circle, or half a semicircle
Quadrant (architecture) a building which arcs in 90 degree manner