RhymeZone: migration definitions

Definitions of migration:

noun: the movement of persons from one country or locality to another
noun: the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding
noun: (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
noun: a group of people migrating together (especially in some given time period)

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See migration used in context: 14 rhymes, several books and articles.