Source : Webster's Revised Unabridged Dictionary (1913)

Decimalize \Dec"i*mal*ize\, v. t.
   To reduce to a decimal system; as, to decimalize the
   currency. -- {Dec`i*mal*i*za"tion}, n.

Source : WordNet®

decimalization
     n : the act of changing to a decimal system; "the decimalization
         of British currency" [syn: {decimalisation}]