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Noun migration has 4 senses
  1. migration - the movement of persons from one country or locality to another
    --1 is a kind of
    motion, movement, move
    --1 has particulars:
     emigration, out-migration, expatriation; immigration, in-migration; gold rush
    Derived form: verb migrate1
  2. migration - a group of people migrating together (especially in some given time period)
    --2 is a kind of
    Derived form: verb migrate1
  3. migration - (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
    --3 is a kind of
  4. migration - the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding
    --4 is a kind of
    periodic event, recurrent event
    Derived form: verb migrate2
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