In a thin section it has a high surface relief and will have sharp boundaries with the surrounding medium.

There was a sharp boundary to the orderly ranks of huge, ancient machines.

As this kind of movement increased, the sharp boundaries between the different comity areas became obscured.

He observes however that these have no sharp boundaries.

There is, however, no sharp boundary between functional and formal equivalence.

The growth along the creek had a sharp boundary.

There is a sharp boundary between the red coat and white marks.

The camper was a tiny world with sharp boundaries, but it couldn't hold off the universe out there.

There was no sharp boundary to the movement, but it shaded off into other groups.

When is it most important to draw sharp boundaries and when to signal room for change?