American English

Definition of migration noun from the Oxford Advanced American Dictionary

      

    migration

     noun
    noun
    NAmE//maɪˈɡreɪʃn//
     
    [uncountable, countable]
     
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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
  2. 2the fact of changing from one computer system to another; the act of moving programs, etc. from one computer system to another
See the Oxford Advanced Learner's Dictionary entry: migration