The part of the near-surface body of an ocean or lake that receives enough sunlight for photosynthesis to be possible.

The forehead and nose considered together as a region of the face that can, in some people, produce excess sebum compared to other parts of the face.

(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.

(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

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

Alternative spelling of no-lone zone

(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.

A neutral area, between hostile forces, designed to prevent hostilities. / (US) A transitional area between areas of different land use.