(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.

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

A manifold or topological space X on which G acts by symmetry in a transitive way.

Alternative spelling of spaceship

(idiomatic) An indication that a development will follow.

plural of space probe

plural of space alien

(chiefly US) An extraterrestrial being; a visitor from outer space.