(mathematics, physics) A four-dimensional real vector space equipped with an inner product of signature (−,+,+,+) or (+,−,−,−), in which special relativity is formulated

In a steam engine, the space enclosed in one end of the cylinder, between the valve(s) and the piston, at the beginning of a stroke; waste room. It includes the space caused by the piston's clearance and the space in ports, passageways, etc. Its volume is often expressed as a certain proportion of the volume swept by the piston in a single stroke.

(topology, logic) A topological space constructed from a Boolean algebra, whose points are ultrafilters on the algebra.

(printing, historical) A thin piece of metal used to open the lines of type to a regular distance from each other, and for other purposes; a lead.

(printing, historical) A fine, thin, short metal rule of the same height as the type, used in printing short lines in tabular matter.

Zariski-Riemann space

The perisinusoidal space, a location in the liver between a hepatocyte and a sinusoid, containing the blood plasma.

Alternative form of spacelore

Alternative form of floorspace

(mathematics) A vector space of functions equipped with a norm that is a combination of Lp-norms of the function itself as well as its derivatives up to a given order.