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