Definition: Long-term migrant
Migration statistics - UNO
A person who moves to a country other than that of his or her usual residence for a period of at least a year (12 months), so that the country of destination effectively becomes his or her new country of usual residence. From the perspective of the country of departure, the person will be a long-term emigrant and from that of the country of arrival, the person will be a long-term immigrant.
United Nations, "Recommendations on Statistics of International Migration", Revision 1, Statistical Papers, Series M, No. 58, United Nations, New York, 1998