GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Plateau , n.; pl. F. Plateaux , E. Plateaus . [F., fr. OF. platel, properly a little plate. See Plate.]
   A flat surface; especially, a broad, level, elevated area of land; a table-land.
   1913 Webster
   An ornamental dish for the table; a tray or salver.
   1913 Webster