Princeton's WordNet

1. naturalize, naturalise(verb)

   adopt to another place

   "The stories had become naturalized into an American setting"

2. naturalize, naturalise(verb)

   make more natural or lifelike

3. naturalize, naturalise(verb)

   make into a citizen

   "The French family was naturalized last year"

4. domesticate, cultivate, naturalize, naturalise, tame(verb)

   adapt (a wild plant or unclaimed land) to the environment

   "domesticate oats"; "tame the soil"