(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.

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

A space transportation system developed by NASA consisting of a reusable winged orbiter, a set of recoverable booster rockets, and a fuel tank. / The reusable winged orbiter of this system.

(mathematics, geometry) A space where the principles of Euclidean geometry apply.

plural of Euclidian space

(functional analysis) A normed vector space which is complete with respect to the norm, meaning that Cauchy sequences have well-defined limits that are points in the space.

(mathematics, physics, dynamical system theory) Given a (dynamical) system, any topological space such that every point in the space's underlying set uniquely represents a state of the system and every possible state is represented by some point;