The Collaborative International Dictionary of English v.0.48:

Colonize \Col"o*nize\, v. t. [imp. & p. p. Colonized; p. pr. &
   vb. n. Colonizing.] [Cf. F. coloniser.]
   To plant or establish a colony or colonies in; to people with
   colonists; to migrate to and settle in. --Bacon.
   [1913 Webster]

         They that would thus colonize the stars with
         inhabitants.                             --Howell.
   [1913 Webster]