Source : Webster's Revised Unabridged Dictionary (1913)

Motorize \Mo"tor*ize\ (m[=o]"t[~e]r*[imac]z), v. t. [Motor +
   -ize.]
   To substitute motor-driven vehicles, or automobiles, for the
   horses and horse-drawn vehicles of (a fire department, city,
   etc.). -- {Mo`tor*i*za"tion}, n.

Source : WordNet®

motorization
     n : the act of motorizing (equiping with motors or with motor
         vehicles) [syn: {motorisation}]