level

This table isn't quite level; see how this marble rolls off it?

Nanny Broome was looking up at the outer wall. Just under the ceiling there were three lunette windows, heavily barred and blacked out in the normal way by centuries of grime. Their bases were on a level with the pavement outside, a narrow way which was several feet lower than the road behind the house.

His pulse has been level for 12 hours.

His voice has been unchanged. It has been level for 12 hours.

He kept a level head under stress.

Young boys and girls

Are level now with men.

a very plain and level account

a level head; a level understanding

Intonation or tone is either level, rising, or falling, marked respectively

The earth's oceans remain level in relation to the pull of gravity.