From Longman Dictionary of Contemporary Englishmigrationmi‧gra‧tion /maɪˈɡreɪʃən/ ●○○ AWL noun [countable, uncountable] 1 LEAVE YOUR HOME/COUNTRYwhen large numbers of people go to live in another area or country, especially in order to find work2 when birds or animals travel regularly from one part of the world to another3 when people start using a different computer system, or information is moved to a different computer system
Examples from the Corpus
migration• Why is there a migration of industry from urban areas towards relatively rural ones?• The United States was created by migration and the modern world has been sculpted by migration.• Both emigration and internal migration became increasingly controlled.• Southerners hotly contended that no violence necessitating migration existed; the resolution was not passed.• One form of black response to the fraud and violence in the South was a substantial migration of blacks northward.• the yearly migration of geese 