The Collaborative International Dictionary of English v.0.48:

Nautch \Nautch\, n. [Hind. n[=a]ch, fr. Skr. n[.r]tya dance.]
   An entertainment consisting chiefly of dancing by
   professional dancing (or Nautch) girls. [India]

   Syn: nauch.
        [1913 Webster]

WordNet (r) 3.0 (2006):

nautch
    n 1: an intricate traditional dance in India performed by
         professional dancing girls [syn: nautch, nauch, nautch
         dance]