'Plateaux' definitions:
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Plateau \Pla*teau"\, n.; pl. F. Plateaux (F. ?; E. ?), E.
Plateaus. [F., fr. OF. platel, properly a little plate. See
Plate.]
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1. A flat surface; especially, a broad, level, elevated area
of land; a table-land.
[1913 Webster]
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2. An ornamental dish for the table; a tray or salver.
[1913 Webster]