Etymology
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in-migration (n.)

1942, American English, in reference to movement within the same country (as distinguished from immigration), from in (prep.) + migration.

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Definitions of in-migration

in-migration (n.)
migration into a place (especially migration to a country of which you are not a native in order to settle there);
Synonyms: immigration
From wordnet.princeton.edu

Dictionary entries near in-migration

inlier

inlighten

inline

inly

inmate

in-migration

inmost

inn

innards

innate

inner