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1768, from French expatrier "banish" (14c.), from ex- "out of" (see ex-) + patrie "native land," from Latin patria "one's native country," from pater (genitive patris) "father" (cf. patriot). Related: Expatriated; expatriating. The noun is from 1818, "one who has been banished;" main modern sense of "one who chooses to live abroad" is 1902.
Voluntary departure from the nation of one's birth for permanent or prolonged residence in another nation.
Voluntarily leaving the nation of one's birth for permanent or prolonged residence in another country.