What is the meaning of naturalized?

verb

• Make into a citizen.
  • usage: "The French family was naturalized last year"
  • synonyms: naturalize, naturalise
• Explain with reference to nature.
  • synonyms: naturalize
• Adopt to another place.
  • usage: "The stories had become naturalized into an American setting"
  • synonyms: naturalize, naturalise
• Make more natural or lifelike.
  • synonyms: naturalize, naturalise
• Adapt (a wild plant or unclaimed land) to the environment.
  • usage: "domesticate oats"; "tame the soil"
  • synonyms: domesticate, cultivate, naturalize, naturalise, tame

adjective

• Introduced from another region and persisting without cultivation.
  • synonyms: established
• Planted so as to give an effect of wild growth.
  • usage: "drifts of naturalized daffodils"
  • synonyms: naturalised