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. 2 the 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