migration : Idioms & Phrases
in-migration
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noun migration into a place (especially migration to a country of which you are not a native in order to settle there)
immigration.
WordNet
migration route
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noun the geographic route along which birds customarily migrate
flyway.
WordNet
out-migration
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noun migration from a place (especially migration from your native country in order to settle in another)
emigration; expatriation.
