The Collaborative International Dictionary of English v.0.48:

Randomize \Ran"dom*ize\, v. t.
   To arrange or rearrange so that there is no predetermined
   order; to make random; to select by a random process; to
   assign (members of a group) into subgroups by a random
   process.

   Syn: make random.
        [PJC]

WordNet (r) 3.0 (2006):

randomize
    v 1: arrange in random order; "Randomize the order of the
         numbers" [syn: randomize, randomise]