Source : Webster's Revised Unabridged Dictionary (1913)

Instrumentality \In`stru*men*tal"i*ty\, n.; pl.
   {Instrumentalities}.
   The quality or condition of being instrumental; that which is
   instrumental; anything used as a means; medium; agency.

         The instrumentality of faith in justification. --Bp.
                                                  Burnet.

         The discovery of gunpowder developed the science of
         attack and defense in a new instrumentality. --J. H.
                                                  Newman.