Source : Webster's Revised Unabridged Dictionary (1913)

Induction generator \In*duc"tion gen"er*a`tor\
   A machine built as an induction motor and driven above
   synchronous speed, thus acting as an alternating-current
   generator; -- called also {asynchronous generator}. Below
   synchronism the machine takes in electrical energy and acts
   as an induction motor; at synchronism the power component of
   current becomes zero and changes sign, so that above
   synchronism the machine (driven for thus purpose by
   mechanical power) gives out electrical energy as a generator.