The amount of space inside the boundary of a closed shape. As in, "there is x room to fit all the aliens inside Area 51."

The amount of space within the boundaries of a two-dimensional shape, reported in square units (like miles2 or feet2). Area is essentially space, but don't go around saying things like "area-ships," "area-cadets," or the "area-bar" on your keyboard.

The two-dimensional space contained by a particular region.

The amount of two-dimensional space that is taken up within a shape's perimeter.

A measurement of surface. It's like the amount of ground a piece of sod will cover, or exactly how much carpet we have to clean after spilling an entire crockpot of chili (oops).

The measure of the amount of space inside a polygon.

The amount of "stuff" inside of a figure. Very technical, we know.