Longman Dictionary of Contemporary English homepage

migration

 noun
     
Related topics: Computers
mi‧gra‧tion [uncountable and countable]
1 when large numbers of people go to live in another area or country, especially in order to find work
2 when birds or animals travel regularly from one part of the world to another
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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