VERB (3)

1. migrate to a new environment;
- Example: "only few plants can immigrate to the island"

2. introduce or send as immigrants;
- Example: "Britain immigrated many colonists to America"

3. come into a new country and change residency;
- Example: "Many people immigrated at the beginning of the 20th century"

The Collaborative International Dictionary of English v.0.48:

Immigrate \Im"mi*grate\, v. t. [imp. & p. p. Immigrated; p.
   pr. & vb. n. Immigrating.] [L. immigrare, immigratum, to
   immigrate; pref. im- in + migrare to migrate. See Migrate.]
   To come into a country of which one is not a native, for the
   purpose of permanent residence. See Emigrate.
   [1913 Webster]

WordNet (r) 3.0 (2006):

immigrate
    v 1: migrate to a new environment; "only few plants can
         immigrate to the island"
    2: introduce or send as immigrants; "Britain immigrated many
       colonists to America"
    3: come into a new country and change residency; "Many people
       immigrated at the beginning of the 20th century" [ant:
       emigrate]