Wiktionary
a. (context obsolete English) Flat and open, like a champaign. n. 1 A plain; a flat expanse of land; a champaign. 2 A species of landscape that is flat and open. 3 The level open countryside, as distinct from the mountains, forests or towns. 4 (context agriculture English) common land; land that is not enclosed 5 Someone who farms land that is not enclosed. 6 A battlefield, especially when flat and open. 7 A field of inquiry or study.
Usage examples of "champian".
As when a Dolphin and a Sele are met,In the wide champian of the Ocean plaine:With cruell chaufe their courages they whet,The maysterdome of each by force to gaine,And dreadfull battaile twixt them do darraine:They snuf, they snort, they bo˜uce, they rage, they rore,That all the sea disturbed with their traine,Doth frie with fome aboue the surges hore.