(poker slang) A poker hand containing only a pair of aces / (bridge slang) A bridge hand with opening points based primarily on aces, so that there are not enough winners.

A parking space reserved for handicapped people.

plural of waste of space

An utterly worthless person, one unworthy of the space which they occupy.

plural of subarachnoid space

(neuroanatomy) The space between the arachnoid mater and the pia mater that surrounds the brain and spinal cord, through which the cerebrospinal fluid circulates and major blood vessels pass, and across which extend delicate trabeculae of connective tissue.

(control engineering) A mathematical model of a physical system as a set of input, output and state variables related by first-order differential equations.

(transitive, intransitive) To format (a document) so that every other line is left blank, leaving sufficient whitespace for annotation (e.g. a teacher's corrections).

(anatomy) The space in the wrist bounded by the hamate, capitate, triquetral and lunate bones.

An opening made by the pupil in the eye.