EXTENSION
, one of the common and essential properties of body; or that by which it possesses or takes up some part of universal space, called the place of that body.
The extension of a body, is properly in every direction whatever; but it is usual to consider it as extended only in length, breadth, and thickness.
EXTERIOR Polygon, or Talus, is the outer or circumscribing one. See Polygon and Talus.