PLAIN
Plain, adv.
Defn: In a plain manner; plainly. "To speak short and pleyn."
Chaucer. "To tell you plain." Shak.
PLAIN
Plain, n. Etym: [Cf. OF. plaigne, F. plaine. See Plain, a.]
1. 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. Descending fro the mountain into playn. Chaucer. Him the Ammonite Worshiped in Rabba and her watery plain. Milton.
2. A field of battle. [Obs.] Arbuthnot. Lead forth my soldiers to the plain. Shak.
PLAIN
Plain, v. t. [imp. & p. p. Plained (; p. pr. & vb. n. Plaining.]
Etym: [Cf. Plane, v.]
1. To plane or level; to make plain or even on the surface. [R.] We would rake Europe rather, plain the East. Wither.
2. To make plain or manifest; to explain. What's dumb in show, I'll plain in speech. Shak.
PLAINANT
Plain"ant, n. Etym: [See 1st Plain.] (Law)
Defn: One who makes complaint; the plaintiff. [Obs.]