The Collaborative International Dictionary of English v.0.48:

Injection \In*jec"tion\, n. [L. injectio : cf. F. injection.]
   1. The act of injecting or throwing in; -- applied
      particularly to the forcible insertion of a liquid or gas,
      by means of a syringe, pump, etc.
      [1913 Webster]

   2. That which is injected; especially, a liquid inserted
      thrown into a cavity of the body by a syringe or pipe; a
      clyster; an enema. --Mayne.
      [1913 Webster]

   3. (Anat.)
      (a) The act or process of filling vessels, cavities, or
          tissues with a fluid or other substance.
      (b) A specimen prepared by injection.
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   4. (Steam Eng.)
      (a) The act of throwing cold water into a condenser to
          produce a vacuum.
      (b) The cold water thrown into a condenser.
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   Injection cock, or Injection valve (Steam Eng.), the cock
      or valve through which cold water is admitted into a
      condenser.

   Injection condenser. See under Condenser.

   Injection pipe, the pipe through which cold water is
      through into the condenser of a steam engine.

   fuel injection, a method of inserting fuel into
      internal-combustion engines by directly forcing the liquid
      fuel into the combustion chamber at an appropriate point
      in the piston cycle; in contrast to carburetion, in
      which an air-fuel mixture is drawn in by the downward
      stroke of the piston.
      [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Condenser \Con*dens"er\, n.
   1. One who, or that which, condenses.
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   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.
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   3. (Chem.) An apparatus for receiving and condensing the
      volatile products of distillation to a liquid or solid
      form, by cooling.
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   4. (Steam Engine) An apparatus, separate from the cylinder,
      in which the exhaust steam is condensed by the action of
      cold water or air. See Illust. of Steam engine.
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   Achromatic condenser (Optics), an achromatic lens used as a
      condenser.

   Bull's-eye condenser, or Bull's-eye (Optics), a lens of
      short focal distance used for concentrating rays of light.


   Injection condenser, a vessel in which steam is condensed
      by the direct contact of water.

   Surface condenser, an apparatus for condensing steam,
      especially the exhaust of a steam engine, by bringing it
      into contact with metallic surface cooled by water or air.
      [1913 Webster]