(taxonomy) A coherent system of taxonomic judgements on circumscription and placement of the considered taxa. A taxonomic system is restricted to a large but limited part of the living world.

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

(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.

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

plural of information system

Any data processing system, either manual or computerized. / Any telecommunications system whose primary function is to transmit and/or display data.

(anatomy) The system of osteons in compact bone