migration — English Dictionary

Noun

1. An instance of moving to live in another place for a while.

   Usage

   • Countable
   • Uncountable

2. Seasonal moving of animals, as mammals, birds or fish, especially between breeding and non-breeding areas.

   Usage

   • Countable
   • Uncountable

   Examples

   More examples (1)

   Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins (Spinus pinus) undergo an irregular, nomadic type of nocturnal migration.

3. Movement in general.

   Usage

   • Countable
   • Uncountable

   Examples

   The migration of lead from a can to the food inside it can cause lead poisoning.

4. Instance of changing a platform from an environment to another one.

   Usage

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   • Uncountable

5. The movement of cells in particular directions to specific locations.

   Usage

   • Countable
   • Uncountable

Noun

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

   Broader terms

   motionmovementmove

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

   Broader terms

   people

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

   Broader terms

   event

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

   Broader terms

   periodic eventrecurrent event