Source : Webster's Revised Unabridged Dictionary (1913)

Naturalize \Nat"u*ral*ize\, v. i.
   1. To become as if native.

   2. To explain phenomena by natural agencies or laws, to the
      exclusion of the supernatural.

            Infected by this naturalizing tendency. --H.
                                                  Bushnell.

Naturalize \Nat"u*ral*ize\ (?; 135), v. t. [imp. & p. p.
   {Naturalized}; p. pr. & vb. n. {Naturalizing}.] [Cf. F.
   naturaliser. See {Natural}.]
   1. To make natural; as, custom naturalizes labor or study.

   2. To confer the rights and privileges of a native subject or
      citizen on; to make as if native; to adopt, as a foreigner
      into a nation or state, and place in the condition of a
      native subject.

   3. To receive or adopt as native, natural, or vernacular; to
      make one's own; as, to naturalize foreign words.

   4. To adapt; to accustom; to habituate; to acclimate; to
      cause to grow as under natural conditions.

            Its wearer suggested that pears and peaches might
            yet be naturalized in the New England climate.
                                                  --Hawthorne.

Source : WordNet®

naturalize
     v 1: make into a citizen; "The French family was naturalized last
          year" [syn: {naturalise}] [ant: {denaturalize}]
     2: explain with reference to nature
     3: adopt to another place; "The stories had become naturalized
        into an American setting" [syn: {naturalise}]
     4: make more natural or lifelike [syn: {naturalise}] [ant: {denaturalize}]
     5: adapt (a wild plant or unclaimed land) to the environment;
        "domesticate oats"; "tame the soil" [syn: {domesticate}, {cultivate},
         {naturalise}, {tame}]