plateau
Concise Oxford English Dictionary © 2008 Oxford University Press:
plateau /ˈplatəʊ/
▶noun (pl. plateaux /-təʊz/ or plateaus)
- 1 an area of fairly level high ground.
- 2 a state or period of little or no change following a period of activity or progress.
– origin C18: from Fr., from OFr. platel, dimin. of plat ‘level’.
'plateau' also found in these Oxford entries:

