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