The Collaborative International Dictionary of English v.0.48:

Jamadar \Jam"a*dar\, n.
   Same as Jemidar.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jemidar \Jem"i*dar`\ (j[e^]m"[i^]*d[aum]r`), n. [Per. & Hind.
   jama-d[=a]r.]
   The chief or leader of a band or body of persons; esp., in
   the native army of India, an officer of a rank corresponding
   to that of lieutenant in the English army. [Written also
   jemadar, jamadar.]
   [1913 Webster]