A system used to determine the result of an election based on the preferences expressed by voters.

(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.

(anatomy) The skin, feathers and other outer coverings of an animal.

feudalism

A burglar alarm.

The Sun and all the heavenly bodies that orbit around it, including the eight planets, their moons, the asteroids, and comets.

In an organized manner; utilising a system.

(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.

An informal method of communication used to pass information to US citizens during emergencies.