late 18th cent.: from French, from Old French platel, diminutive of plat 'level'
A broad valley opened up leading to a high, flat plateau of cultivated land.
The US heroin market now appears to have reached a plateau...
I think the economy is stuck on a kind of plateau of slow growth.
Evelyn's career is accelerating, and mine is plateauing out a bit...
The shares plateaued at 153p.