The Collaborative International Dictionary of English v.0.48:

Maidan \Mai*dan"\, n. [Written also midan, meidan, mydan,
   etc.] [Hind. & Per. maid[=a]n, fr. Ar. maid[=a]n.]
   In various parts of Asia, an open space, as for military
   exercises, or for a market place; an open grassy tract; an
   esplanade.

         A gallop on the green maidan.            --M. Crawford.
   [Webster 1913 Suppl.]