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English definition of “plateau”

plateau

noun [C] uk   /ˈplæt.əʊ/ us    /plætˈoʊ/ (plural UK plateaux   /-z/   or US also plateaus)

plateau noun [C] (FLAT LAND)

a large flat area of land that is high above sea level

plateau noun [C] (NO CHANGE)

a period during which there are no large changes: The US death rate reached a plateau in the 1960s, before declining suddenly.

plateau

verb [I] uk   /ˈplæt.əʊ/ us    /plætˈoʊ/
to reach a particular level and then stay the same: I'd been losing about a pound a week on my diet, but recently I've plateaued and haven't lost an ounce. The economic slowdown has caused our sales to plateau.
(Definition of plateau from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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