1. (noun) (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule

• chemical science
• chemistry

1. (noun) the movement of persons from one country or locality to another

• emigration
• expatriation
• out-migration
• gold rush
• immigration
• in-migration

1. (noun) the movement of persons from one country or locality to another

• motion
• move
• movement

2. (noun) a group of people migrating together (especially in some given time period)

• people

3. (noun) (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule

• event

4. (noun) the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding

• periodic event
• recurrent event

1. (noun) the movement of persons from one country or locality to another

• migrate
• transmigrate
• migrational

2. (noun) a group of people migrating together (especially in some given time period)

• migrate
• transmigrate

3. (noun) the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding

• migrate
• migrational