Definition of migration noun from the Oxford Advanced Learner's Dictionary

      

    migration

     noun
    noun
    BrE BrE//maɪˈɡreɪʃn//
     
    ; NAmE NAmE//maɪˈɡreɪʃn//
     
    [uncountable, countable] Immigration
     
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  1. 1the movement of large numbers of people, birds or animals from one place to another seasonal migration mass migrations the migration routes of birds See related entries: Immigration
  2. 2the act of moving programs, etc. from one computer system to another; the fact of changing from one computer system to another
  3. Extra examples The decline of the rural economy has caused urban migration. changes in the migration routes of reindeer migration from rural to urban areas the forced migration of African slaves the great waves of migration that took Europeans to the New World the seasonal migration of birds
See the Oxford Advanced American Dictionary entry: migration