Webster's English Dictionary

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improvise

im.pro.vise or im.pro.vi.sor \.im-pr*-'vi-z\ \-'vi--z*r\ vb [F improviser, 
   fr. It improvvisare, fr. improvviso sudden, fr]. L improvisus, lit., 
   unforeseen, fr. in- + provisus, pp. of provide-re to see ahead - more at 
   PROVIDE 1: to compose, recite, or sing on the spur of the moment : 
   EXTEMPORIZ E 2: to make, invent, or arrange offhand  : to improvise 
   something  - im.pro.vi.ser n