(mathematics) A measure of the extent of a surface; it is measured in square units. / A particular geographic region. / Any particular extent of surface, especially an empty or unused extent.

plural of area

(geometry) The total area on the surface of an object. / (computing) The total resources of a system that are accessible from the outside world and thus might be attacked.

A piece of land or a room that is designed for the use of multiple visitors to or inhabitants of a place.

An area of population usually with a central or core city and surrounding towns or suburbs.

(neuroanatomy) An area of the frontal lobe of the brain associated with the control of speech.

(idiomatic) An area intermediate between two mutually exclusive states or categories, where the border between the two is fuzzy.

(informal, US, military, aviation, research, espionage, ufology) A secret military facility, an airport, an airbase in Nevada Test and Training Range, Nevada, United States; A military base in Nevada, where advanced military aircraft are developed; foreign military aircraft are evaluated; and rumored to be where the US government hides extra-planetary alien visitors.

(air traffic control) an airspace within which it is dangerous for aircraft to fly.

(cricket) the central, rectangular area of the pitch onto which the bowlers may not run during their follow through