Plain Definition

plān
plainest, plains, plainer
adjective
plainest, plainer
Free from obstructions; open; clear.
In plain view.
Webster's New World
Clearly understood; evident; obvious.
To make one's meaning plain.
Webster's New World
Marked by little or no ornamentation or decoration.
Plain garb.
American Heritage
Outspoken; frank; straightforward.
Plain talk.
Webster's New World
Downright; thoroughgoing.
Plain nonsense.
Webster's New World
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noun
plains
An extent of relatively level country with few trees; prairie, steppe, etc.
Webster's New World
A broad level expanse, as a part of the sea floor or a lunar mare.
American Heritage
Something free of ornamentation or extraneous matter.
American Heritage

(rare, poetic) A lamentation.

Wiktionary
Wiktionary
Synonyms:
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adverb
Clearly or simply.
Just plain tired.
Webster's New World

(colloquial) Simply.

It was just plain stupid.
I plain forgot.
Wiktionary
verb
plains
To complain.
Webster's New World

(intransitive, now rare, poetic) To lament, bewail.

To plain a loss.
Wiktionary

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

Wiktionary

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

Wiktionary
Synonyms:
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Other Word Forms of Plain

Noun

Singular:
plain
Plural:
Plains

Adjective

Base Form:
plain
Comparative:
plainer
Superlative:
plainest

Origin of Plain

  • From Anglo-Norman plainer, pleiner, variant of Anglo-Norman and Old French pleindre, plaindre, from Latin plangere, present active infinitive of plangō.

    From Wiktionary

  • From Anglo-Norman pleyn, playn, Middle French plain, plein, from Latin plānus (“flat, even, level, plain").

    From Wiktionary

  • From Old French plain, from Latin plānum (“level ground, a plain"), neuter substantive from plānus (“level, even, flat").

    From Wiktionary

  • Middle English from Old French from Latin plānus pelə-2 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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