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1. A level piece of ground.
2. The surface included within a set of lines; specifically, the number of unit squares equal in measure to the surface.
3. The scope of a concept, operation, or activity; a field.
4. Etymology: Latin, "open space, threshing floor"; perhaps akin to Latin arēre, "to be dry"; more at arid.
This entry is located in the following unit: arid- + (page 1)