(American football) A zone between the defensive line of scrimmage and the offensive line of scrimmage.

A structural feature of an automobile/motor car designed to compress during an accident and absorb impact energy.

A geographic area in which some sanctioning authority prohibits specific activities, see also Restricted Area.

(biology) an environment that allows the development of adaptive radiation

(baseball) The area through which if a pitched ball passes, it will be called a strike, typically from the batter's knees to the belt and the width of home plate.

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

Any large portion of the Earth's land area which has a generally uniform climate and soil and therefore a high degree of uniformity in the composition of species; a number of different classifications have been proposed by different people.

An airspace in which aircraft, especially military aircraft, are forbidden to fly.

(physics, chemistry) A technique used to purify a metal, semiconductor or other solid in which a heating system slowly causes a series of molten zones to traverse the solid, leaving purer material behind it.

(geography) The part of the Earth between the geographical South Pole and the Antarctic Circle.