Jane Spillman of Corning Museum of Glass responds to the question of the difference between cut and engraved glass. If you ask a cutter or an engraver about the difference, I think the answer would be the difference is in the way the cutter or engraver holds his glass to the wheel. A cutter holds his glass against the wheel so that the surface he is cutting is away from him and he can’t see it. If you look at photographs you’ll see that the glass object is between the cutter and the cutting wheel. An engraver holds his glass up to the wheel so that he can see the surface that’s being worked on.

That’s the way it was explained to me.

Dick Stark of Bethesda, MD says
degree….configuration to an extent. from etching to deep copper wheel incising to the point intaglio can approach cameo=like appearance…..

John Styler states
As a collector of American Brilliant cut glass I would say it is obvious. I do have one piece that is both American Brilliant and engraved, but the signature is to faint to recognize.