EMIGRATION
emigration, out-migration, expatriation
(noun) migration from a place (especially migration from your native country in order to settle in another)
Source: WordNet® 3.1
Etymology
Noun
emigration (countable and uncountable, plural emigrations)
The act of emigrating; movement of a person or persons out of a country or national region, for the purpose of permanent relocation of residence.
A body of emigrants; emigrants collectively
Source: Wiktionary
Em`i*gra"tion, n. Etym: [L. emigratio: cf. F. émigration.]
1. The act of emigrating; removal from one country or state to
another, for the purpose of residence, as from Europe to America, or,
in America, from the Atlantic States to the Western.
2. A body emigrants; emigrants collectively; as, the German
emigration.
Source: Webster’s Unabridged Dictionary 1913 Edition