Definition of plain noun from the Oxford Advanced Learner's Dictionary

 

plain

 noun
noun
BrE BrE//pleɪn//
 
; NAmE NAmE//pleɪn//
 
Other geographic regions
 
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(also plains [plural]) a large area of flat land the flat coastal plain of Thassos the Great Plains see also floodplain See related entries: Other geographic regions Word Origin Middle English: from Old French plain, from Latin planus, from a base meaning ‘flat’.Extra examples Cattle move freely across the grassy plain. Herds of buffalo roamed these plains. Nothing grew on the plain. The horses galloped across the open plains. fertile plains suitable for farming miles of rolling plain, made fertile by the river the Olduvai Gorge in the vast plain of Tanzania Millions of buffalo used to roam freely across the Great Plains. To the east lies the flat coastal plain of the Yucatan peninsula.
See the Oxford Advanced American Dictionary entry: plain