(neuroanatomy) The part of the nervous system which is not the central nervous system.

(neuroanatomy) In humans and other vertebrates, the part of the nervous system that regulates the involuntary activity of the heart, intestines and glands. These activities include digestion, respiration, perspiration, metabolism, and the modulation of blood pressure.

An electronic system used to store, process and display geographic information, especially maps

(informal) Everything is ready.

A navigation system that produces hyperbolic lines of position by the measurement of the difference in the time of reception, or the phase, of radio signals from multiple synchronized transmitters at fixed locations.

(aviation) A collection of radio navigation aids (always including a localizer and glideslope, and often one to three marker beacons as well) used by pilots for approach guidance to a specific airport runway, especially when visibility is limited.

(rare, organic chemistry) Any organic compound, in the form of a ring, that has the maximum number of noncumulative double bonds; e.g. benzene or indole.

(computing, Internet) The distributed database, sometimes including all the supporting hardware or software infrastructure, the Internet uses to translate hostnames into IP addresses and provide other domain-related information.

Any electronic navigation system which uses space satellites as radio signal sources and position references. / A satellite network used for implementing such a system.

Any assemblage of equipment used to generate, store and distribute electrical power on board a satellite or spacecraft