expatriate

Short definition from Wiktionary

Adjective

1. 1
   Living outside of one's own country.

Noun

1. 1
   One who lives outside one's own country, especially temporarily for a profession or education.
2. 2
   One who has been banished from one's own country.

Verb

1. 1
   To banish; to drive or force (a person) from his own country; to make an exile of.
2. 2
   To withdraw from one’s native country.
3. 3
   To renounce the rights and liabilities of citizenship where one is born and become a citizen of another country.