Webster's English Dictionary

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migrate

mi.grate \'mi--.gra-t\ \mi--'gra--sh*n\ \-shn*l, -sh*n-*l\ \'mi--.gra-t-*r\ 
   vi [L migratus, pp. of migrare; akin to Gk ameiben to change] 1: to move 
   from one country, place, or locality to another  2: to pass usu. 
   periodically from one region or climate to another for fee ding or breeding 
   3: to change position in an organism or substance  - mi.gra.tion n