Source : Webster's Revised Unabridged Dictionary (1913)

Condenser \Con*dens"er\, n.
   1. One who, or that which, condenses.

   2. (Physic)
      (a) An instrument for condensing air or other elastic
          fluids, consisting of a cylinder having a movable
          piston to force the air into a receiver, and a valve
          to prevent its escape.
      (b) An instrument for concentrating electricity by the
          effect of induction between conducting plates
          separated by a nonconducting plate.
      (c) A lens or mirror, usually of short focal distance,
          used to concentrate light upon an object.

Source : WordNet®

condenser
     n 1: an electrical device characterized by its capacity to store
          an electric charge [syn: {capacitor}, {capacitance}, {electrical
          condenser}]
     2: an apparatus that converts vapor into liquid
     3: a hollow coil that condenses by abstracting heat
     4: lens used to concentrate light on an object [syn: {optical
        condenser}]