utilization

from WordNet (r) 3.0 (2006)

utilization
    n 1: the act of using; "he warned against the use of narcotic
         drugs"; "skilled in the utilization of computers" [syn:
         {use}, {usage}, {utilization}, {utilisation}, {employment},
         {exercise}]
    2: the state of having been made use of; "the rate of
       utilization"

from The Collaborative International Dictionary of English v.0.48

Utilization \U`til*i*za"tion\, n. [Cf. F. utilization.]
   The act of utilizing, or the state of being utilized.
   [1913 Webster]