PLATEAU
tableland, plateau
(noun) a relatively flat highland
Source: WordNet® 3.1
Etymology
Noun
plateau (plural plateaus or plateaux)
A largely level expanse of land at a high elevation; tableland.
A comparatively stable level in something that varies.
(dated) An ornamental dish for the table; a tray or salver.
(sports, broadcasting) A notable level of attainment or achievement.
Verb
plateau (third-person singular simple present plateaus, present participle plateauing, simple past and past participle plateaued)
(intransitive) To reach a stable level; to level off.
Source: Wiktionary
Pla*teau", n.; pl. F. Plateaux (F. , E. Plateaus. Etym: [F., fr. OF.
platel, properly a little plate. See Plate.]
1. A flat surface; especially, a broad, level, elevated area of land;
a table-land.
2. An ornamental dish for the table; a tray or salver.
Source: Webster’s Unabridged Dictionary 1913 Edition