What is "naturalizing"

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.

vb. (present participle of naturalize English)