Definify.com
Webster 1913 Edition
Plateau
Pla-teau′
,Noun.
pl. F. 
Plateaux 
(F. [GREEK]; E. [GREEK])
, 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. 
2. 
An ornamental dish for the table; a tray or salver. 
Definition 2025
Plateau
plateau
plateau
See also: Plateau
English

Diagram showing plateaus.
Noun
plateau (plural plateaus or plateaux)
- A largely level expanse of land at a high elevation; tableland.
 - A comparatively stable level in something that varies.
 - (dated) An ornamental dish for the table; a tray or salver.
 - (sports, broadcasting) A notable level of attainment or achievement.
 
Translations
level expanse
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stable level
Verb
plateau (third-person singular simple present plateaus, present participle plateauing, simple past and past participle plateaued)
- (intransitive) To reach a stable level; to level off.
 
Translations
level off
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