Plain 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. [1913 Webster]

Descending fro the mountain into playn. --Chaucer. [1913 Webster]

Him the Ammonite Worshiped in Rabba and her watery plain. --Milton. [1913 Webster]

2. A field of battle. [Obs.] --Arbuthnot. [1913 Webster]

Lead forth my soldiers to the plain. --Shak. [1913 Webster]

The Collaborative International Dictionary of English. 2000.