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English word plateau comes from Proto-Indo-European *pleth₂-, Proto-Indo-European *pleth₂os, and later Proto-Indo-European *pléth₂us (Flat, broad.)
*pleth₂- (Proto-Indo-European)
*pleth₂os (Proto-Indo-European)
*pléth₂us (Proto-Indo-European)
Flat, broad.
πλατεῖα (Ancient Greek)
*plattus (Latin)
Flattened.
plat (Middle French)
plat (French)
Flat A flat area of ground; a flat thing; a flat dish or receptacle. Dish or course (e.g. served in a restaurant).
plateau (French)
(geography) plateau. Flat area. Stage (in theatre); set (of television broadcast). Tray.
plateau (English)
(dated) An ornamental dish for the table; a tray or salver.. (sports, broadcasting) A notable level of attainment or achievement.. A comparatively stable level in something that varies.. A largely level expanse of land at a high elevation; tableland. (intransitive) To reach a stable level; to level off.