Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: French
Origin: Old French platel 'flat piece of metal', from plat; PLATE1

plateau

1 noun
     
NEW! See related topics: GEOGRAPHY
plat‧eau1 plural plateaus or plateaux [countable]
1SG a large area of flat land that is higher than the land around it
2 a period during which the level of something does not change, especially after a period when it was increasing:
Inflation rates have reached a plateau.
Definition from the Longman Dictionary of Contemporary English
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