WordWeb Online

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

Derived forms: migrations

See also: migrate, migrational

Type of: event, motion, move, movement, people, periodic event, recurrent event

Encyclopedia: Migration