(mathematics, physics) A space in which a generalization of quantum mechanics is described in terms of a system with a finite number of degrees of freedom

(geology) All the pores in a rock; the volume of such pores

Any weapon that travels through space to a target either in space, in the atmosphere or on the ground

(computing) A key, in the shape of a bar, near the bottom of a keyboard, that generates a space character when pressed.

Any form of research that takes place in space, or concerns any aspect of space or space travel

(meteorology) Any phenomena related to the radiation and particles emitted by the Sun, especially in the vicinity of the Earth that may have an effect on the Earth or human activity in the space.

That part of an optical system where real or virtual images are formed

A broad step between flights of a staircase. / (mathematics) Either of the two parts of three-dimensional space divided by a plane.

(mathematics) Any topological space which cannot be written as the disjoint union of two or more nonempty open spaces.

(mathematics) Any Riemann space in which the metric tensors are constants throughout