Source : Webster's Revised Unabridged Dictionary (1913)

Electro-motive \E*lec`tro-mo"tive\, a.
   Producing electro-motion; producing, or tending to produce,
   electricity or an electric current; causing electrical action
   or effects.

   {Electro-motive force} (Physics), the force which produces,
      or tends to produce, electricity, or an electric current;
      sometimes used to express the degree of electrification as
      equivalent to potential, or more properly difference of
      potential.