'Plateau' definitions:

Definition of 'plateau'

(from WordNet)
noun
A relatively flat highland [syn: tableland, plateau]

Definition of 'Plateau'

From: GCIDE
  • Plateau \Pla*teau"\, n.; pl. F. Plateaux (F. ?; E. ?), E. Plateaus. [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. [1913 Webster]
  • 2. An ornamental dish for the table; a tray or salver. [1913 Webster]