Source : Webster's Revised Unabridged Dictionary (1913)

Motivity \Mo*tiv"i*ty\, n. [See {Motive}, n.]
   1. The power of moving or producing motion.

   2. The quality of being influenced by motives. [R.]

Source : WordNet®

motivity
     n : the power or ability to move [syn: {locomotion}, {motive
         power}]