Definitions mean boundaries, and all of these terms make clear that the boundaries we once knew are disappearing.

It was one of those through-the-looking-glass moments that sum up an era in which the boundaries between reality and entertainment have disappeared.

What happens when we're always connected is that the boundary between work and play disappears.

A common theme among these writers, many of whom are of mixed blood, is the search for an identity in a world where cultural boundaries are gradually disappearing.

And as old boundaries disappear, new ones emerge, this time between operating systems and hardware.

Physical boundaries are disappearing .

In that room, the boundaries between the wall and ceiling disappeared.

This is becoming more common in the European Union where national boundaries are disappearing.

And a few design errors remain, like the selection tool whose boundaries often disappear when the grid is enabled.

Nowadays, the boundaries between adult and children's fiction are disappearing.