The region, between the Tropic of Cancer and the Tropic of Capricorn, characterised by a hot and humid climate; the tropics.

An area into which entry by a single individual is prohibited; commonly an area with accessibility to a nuclear weapon.

(sports) The bottom part of e.g. a sports table, listing how well teams have played over a period of time. All teams that end up in the relegation zone are relegated.

Alternative spelling of no-lone zone

(military) Rear part of a theater of war or theater of operations (behind but contiguous to the combat zone) which contains the lines of communications, establishments for supply and evacuation, and other agencies required for the immediate support and maintenance of the field forces. Also called COMMZ.

Those parts of the Earth's surface between the tropics and the polar regions

(military) An area into which a designated ground unit or fire support ship delivers, or is prepared to deliver, fire support. Fire may or may not be observed.

(military) A tactical subdivision of a larger area, the responsibility for which is assigned to a tactical unit; generally applied to offensive action.

(geology) A region of the Earth where one tectonic plate dives beneath another into the interior of the Earth.

(geology) the layer of the Earth's crust, at the top of the asthenosphere, where most earthquakes originate