Dictionary.com

plain

1
[ pleyn ]
/ pleɪn /
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See synonyms for: plain / plains / plainly / plainness on Thesaurus.com

adjective, plain·er, plain·est.

adverb

clearly and simply: He's just plain stupid.

noun

an area of land not significantly higher than adjacent areas and with relatively minor differences in elevation, commonly less than 500 feet (150 meters), within the area.
The Plains. Great Plains.

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

Origin of plain

1
1250–1300; Middle English (adj., adv., and noun) <Old French (adj. and noun) <Latin plānus flat, level, plānum flat country
10. See homely.
plainly, adverbplainness, noun
plain , plan, plane

Definition for plain (2 of 2)

plain2
[ pleyn ]
/ pleɪn /

verb (used without object) British Dialect.

to complain.

Origin of plain

2
1250–1300; Middle English plei(g)nen<Old French plaign-, stem of plaindre<Latin plangere to beat (the breast, etc.), lament; akin to Greek plḗssein to strike
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for plain (1 of 2)

plain1
/ (pleɪn) /

adjective

noun

adverb

(intensifier)just plain tired
See also plains
plainly, adverbplainness, noun
C13: from Old French: simple, from Latin plānus level, distinct, clear

British Dictionary definitions for plain (2 of 2)

plain2
/ (pleɪn) /

verb

a dialect or poetic word for complain
C14 pleignen, from Old French plaindre to lament, from Latin plangere to beat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for plain

plain
[ plān ]

An extensive, relatively level area of land. Plains are present on all continents except Antarctica and are most often located in the interior regions. Because they can occur at almost any altitude or latitude, plains can be humid and forested, semiarid and grass-covered, or arid.
A broad, level expanse, such as an area of the sea floor or a lunar mare.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with plain

plain

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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