IMMIGRATION
immigration, in-migration
(noun) migration into a place (especially migration to a country of which you are not a native in order to settle there)
immigration
(noun) the body of immigrants arriving during a specified interval; “the increased immigration strengthened the colony”
Source: WordNet® 3.1
Etymology
Noun
immigration (countable and uncountable, plural immigrations)
The act of immigrating; the passing or coming into a country of which one is not native born for the purpose of permanent residence.
Source: Wiktionary
Im"mi*gra"tion, n. Etym: [Cf. F. immigration.]
Definition: The act of immigrating; the passing or coming into a country
for the purpose of permanent residence.
The immigrations of the Arabians into Europe. T. Warton.
Source: Webster’s Unabridged Dictionary 1913 Edition