plain

adv. simply, in an unembellished manner; clearly, simply

adj. clear, evident; simple, unembellished; ugly, unattractive; flat, smooth

n. plateau, area of level ground; prairie, savanna

In geography, a plain is a large area of land with relatively low relief. Plains may be more suitable for farming than plateaus or mountains. Plains are sometimes remnants of much larger features that are now largely eroded, such as mountains or volcanoes.
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Noun
1. extensive tract of level open land; "they emerged from the woods onto a vast open plain"; "he longed for the fields of his youth"
(synonym) field, champaign
(hypernym) land, dry land, earth, ground, solid ground, terra firma
(hyponym) Olympia
2. a basic knitting stitch
(synonym) knit, knit stitch, plain stitch
(hypernym) knitting stitch
Verb
1. express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about"
(synonym) complain, kick, sound off, quetch, kvetch
(hyponym) nag, peck, hen-peck
Adjective
1. clearly apparent or obvious to the mind or senses; "the effects of the drought are apparent to anyone who sees the parched fields"; "evident hostility"; "manifest disapproval"; "patent advantages"; "made his meaning plain"; "it is plain that he is no reactionary"; "in plain view"
(synonym) apparent, evident, manifest, patent
(similar) obvious
2. not elaborate or elaborated; simple; "plain food"; "stuck to the plain facts"; "a plain blue suit"; "a plain rectangular brick building"
(antonym) fancy
(similar) austere, severe, stark
(see-also) simple
3. lacking patterns especially in color
(synonym) unpatterned
(antonym) patterned
(similar) solid, self-colored, self-coloured
4. not mixed with extraneous elements; "plain water"; "sheer wine"; "not an unmixed blessing"
(synonym) sheer, unmingled, unmixed
(similar) pure
5. free from any effort to soften to disguise; "the plain and unvarnished truth"; "the unvarnished candor of old people and children"
(synonym) unvarnished
(similar) direct
6. lacking embellishment or ornamentation; "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"
(synonym) unembellished, unornamented
(similar) unadorned, undecorated
7. lacking stylistic embellishment; "a literal description"; "wrote good but plain prose"; "a plain unadorned account of the coronation"; "a forthright unembellished style"
(synonym) literal, unembellished
(similar) unrhetorical
8. comprehensible to the general public; "written for the popular press in plain nontechnical language"
(synonym) popular
(similar) general
9. lacking in physical beauty or proportion; "a homely child"; "several of the buildings were downright homely"; "a plain girl with a freckled face"
(synonym) homely
(similar) unattractive
Adverb
1. unmistakably (`plain' is often used informally for `plainly'); "the answer is obviously wrong"; "she was in bed and evidently in great pain"; "he was manifestly too important to leave off the guest list"; "it is all patently nonsense"; "she has apparently been living here for some time"; "I thought he owned the property, but apparently not"; "You are plainly wrong"; "he is plain stubborn"
(synonym) obviously, evidently, manifestly, patently, apparently, plainly
(classification) colloquialism

(a.)
A field of battle.
  

(a.)
Level land; usually, an open field or a broad stretch of land with an even surface, or a surface little varied by inequalities; as, the plain of Jordan; the American plains, or prairies.
  

(adv.)
In a plain manner; plainly.
  

(superl.)
Free from affectation or disguise; candid; sincere; artless; honest; frank.
  

(superl.)
Not highly cultivated; unsophisticated; free from show or pretension; simple; natural; homely; common.
  

(superl.)
Not intricate or difficult; evident; manifest; obvious; clear; unmistakable.
  

(superl.)
Not luxurious; not highly seasoned; simple; as, plain food.
  

(superl.)
Not much varied by modulations; as, a plain tune.
  

(superl.)
Not variegated, dyed, or figured; as, plain muslin.
  

(superl.)
Open; clear; unencumbered; equal; fair.
  

(superl.)
Void of extraneous beauty or ornament; without conspicious embellishment; not rich; simple.
  

(superl.)
Without beauty; not handsome; homely; as, a plain woman.
  

(superl.)
Without elevations or depressions; flat; level; smooth; even. See Plane.
  

(v. i.)
To lament; to bewail; to complain.
  

(v. t.)
To lament; to mourn over; as, to plain a loss.
  

(v.)
To make plain or manifest; to explain.
  

(v.)
To plane or level; to make plain or even on the surface.
  

Programming LAnguage for INteraction. Pascal-like, with extensions for database, string handling, exceptions and pattern matching. "Revised Report on the Programming Language PLAIN", A. Wasserman, SIGPLAN Notices 6(5):59-80 (May 1981).