What is the meaning of the word "immigrate"?

Definitions:

  1. come into a new country and change residency copy to clipboard verb
    • Many people immigrated at the beginning of the 20th century copy to clipboard
  2. introduce or send as immigrants copy to clipboard verb
    • Britain immigrated many colonists to America copy to clipboard
  3. migrate to a new environment copy to clipboard verb
    • only few plants can immigrate to the island copy to clipboard