ex·pa·tri·ate /ek-'spā-trē-ˌāt/ vb -at·ed, -at·ing
vt: to voluntarily withdraw (oneself) from allegiance to one's native country
vi: to renounce allegiance to one's country and abandon one's nationality voluntarily
ex·pa·tri·ate /-trē-ət/ n
ex·pa·tri·a·tion /ek-ˌspā-trē-'ā-shən/ n
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.