1768, from Fr. expatrier "banish," from ex- "out of" + patrie "native land," from L. patria "one's native country," from pater (gen. patris ) "father." Related: Expatriated ; expatriating ;expatriation . The noun is from 1818, "one who has been banished;" main modern sense of "one who chooses to live abroad"is 1902.
Yes, that's right - I am going to be an expat "choosing to live abroad." The preparations are being made; it will be a month or so before we are actually in Luxembourg. In the meantime - Berlitz language training!!