Толковый словарь английского языка - plateau

I. noun (plural ~s or ~x) Etymology: French, from Middle French, platter, from plat flat Date: 1796 1. a usually extensive land area having a relatively level surface raised sharply above adjacent land on at least one side ; tableland, a similar undersea feature, 2. a region of little or no change in a graphic representation, a relatively stable level, period, or condition, a level of attainment or achievement , II. intransitive verb Date: 1939 to reach a level, period, or condition of stability or maximum attainment