KJV Dictionary Definition: plain
PLAIN, a. L. planus; splendor. Gr. to wander.
1. Smooth; even; level; flat; without elevations and depressions; not rough; as plain ground or land; a plain surface. In this sense, in philosophical writings, it is written plane.
2. Open; clear.
Our troops beat an army in plain fight and open field.
3. Void of ornament; simple; as a plain dress.
Plain without pomp, and rich without a show.
4. Artless; simple; unlearned; without disguise, cunning or affectation; without refinement; as men of the plainer sort.
Plain but pious christians--
5. Artless; simple; unaffected; unembellished; as a plain tale or narration.
6. Honestly undisguised; open; frank; sincere; unreserved. I will tell you the plain truth.
Give me leave to be plain with you.
7. Mere; bare; as a plain knave or fool.
8. Evident to the understanding; clear; manifest; not obscure; as plain words or language; a plain difference; a plain argument.
It is plain in the history, that Esau was never subject to Jacob.
9. Not much varied by modulations; as a plain song or tune.
10. Not high seasoned; not rich; not luxuriously dressed; as a plain diet.
11. Not ornamented with figures; as plain muslin.
12. Not dyed.
13. Not difficult; not embarrassing; as a plain case in law.
14. Easily seen or discovered; not obscure or difficult to be found; as a plain road or path. Our coarse is very plain. Ps.27.
A plain or plane figure, in geometry, is a uniform surface, from every point of whose perimeter right lines may be drawn to every other point in the same.
A plain figure, in geometry, is a surface in which, if any two points are taken,the straight line which joins them lies wholly in that surface.
A plain angle, is one contained under two lines or surfaces, in contradistinction to a solid angle.
PLAIN, adv. Not obscurely; in a manner to be easily understood.
1. Distinctly; articulately; as, to speak plain. Mark 7.
2. With simplicity; artlessly; bluntly.
1. Level land; usually, an open field with an even surface, or a surface little varied by inequalities; as all the plain of Jordan. Gen.13.
2. Field of battle.
PLAIN, v.t. To level; to make plain or even on the surface.
PLAIN, v.i. L. plango. To lament or wail. Not used. See Complain.
PLA'INNESS, n. Levelness; evenness or surface.
1. Want of ornament; want of artificial show.
So modest plainness sets off sprightly wit.
2. Openness; rough, blunt or unrefined frankness.
Your plainness and your shortness please me well.
3. Artlessness; simplicity; candor; as unthinking plainness.
4. Clearness; openness; sincerity.
Seeing then we have such hope, we use great plainness of speech. 2 Cor.3.