Coterminous Versus Coexistent
Planes may border (be coterminous) or may be coexistent. In particular, the Ethereal and Shadow planes are coexistent with the Material Plane. In effect, the "boundary" between the two extends through all of space. Thus a ghost in Dungeons & Dragons, which is an ethereal creature, has a location on the Material Plane when it is near the border of the Material and Ethereal planes. It can "manifest" itself into the Material, and force attacks launched from the Material can hit it.
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Famous quotes containing the word coexistent:
“What stuff is the man made of who is not coexistent in our thought with the purest and sublimest truth?”
—Henry David Thoreau (1817–1862)