1. To grant citizenship: Virginia was new to Germany and was naturalized because she was married to a German.
2. To make more lifelike: To naturalize is also to make less artificial or free from conventionality.
3. To transform a piece of unclaimed land or adapt a wild plant to a new environment: Lynn wanted to have her poppy seeds grow and naturalize them into the new surroundings, but she wasn't lucky!
4. To adopt a custom into a new country: When Monika moved to America, she introduced and naturalized the tradition of the typical German Christmas into her family life.