Migration (noun)

1. The process of moving from one place to another, especially to take up permanent or semipermanent residence.
2. A group of animals, especially birds, moving from one place to another.

Origin:

Late middle english (denoting a journey of the magi to bethlehem): from old french, from latin migratio(n-), from migrare 'remove, change one's place'.

Examples:

1. The migration of the geese to the south for the winter is a yearly event.
2. The migration of people to the cities in search of work has led to overcrowding and social problems.
3. The migration of the software company to a new location was a big success.
4. The annual migration of the wildebeest is a remarkable natural spectacle.
5. The migration of data from one system to another was completed successfully.