(physics) A difference of a quarter of a wavelength between the spatial positions of two corresponding points in a wave

(computing) a parameter (in some file systems) that specifies the storage space required for a new file

Any device that attempts to simulate the environment of space, especially one used to test components of space vehicles

A journey, by a human or robotic spacecraft, into space for a specific reason (normally to gather scientific data)

(computing) The suppression of the normal advancement of paper in a printer after printing a line of text.

A portable heating appliance used to warm an area or room.

A vehicle (or a compartment of a vehicle) designed to transport, and provide life support for people in space, and during reentry through the Earth's atmosphere

(architecture) A three-dimensional truss, often of steel, forming a rigid, stable structure

(probability theory) The set of all possible outcomes of a game, experiment or other situation.

(mathematics) The vector space generated by all the row vectors of a matrix.