Etymology
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immigration (n.)

1650s, noun of action from immigrate. As "immigrants collectively," from 1852. As short for "immigration authorities," from 1966.

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Definitions of immigration

immigration (n.)
migration into a place (especially migration to a country of which you are not a native in order to settle there);
Synonyms: in-migration
immigration (n.)
the body of immigrants arriving during a specified interval;
the increased immigration strengthened the colony
From wordnet.princeton.edu