A system of circulation which is achieved primarily from the heart beating and muscle-induced locomotion of the organism, circulation without veins.

A set of axioms or axiom schemata from which theorems can be derived.

A subdivision of the peripheral nervous system that directly controls the gastrointestinal system.

The system of fraternities and sororities in North American colleges.

A computer system that uses techniques derived from artificial intelligence, particularly one in which such techniques are central to the operation or design of the system.

The part of the peripheral nervous system that transmits signals from the central nervous system to skeletal muscles, and from receptors of external stimuli, thereby mediating sight, hearing and touch.

(law) A system of law in which advocates represent the prosecution and the defence and an impartial person (judge) or people (jury) determine the truth of the matter

(physics) A localized physical system consisting of interacting components, called degrees of freedom

(mathematics) The complete Archimedean ordered field (of real numbers).

(mathematics) The real number system adjoined with two extra symbols: ∞ and −∞, inheriting the ordering of the real number system, and defining −∞ to be less than any real number, and ∞ to be larger than any real number.