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The Collaborative International Dictionary of English v.0.48 (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]