Plain, n. [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. Arbuthnot.
Lead forth my soldiers to the plain. Shak.