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