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Adjective: migratory  'mI-gru,to-ree [N. Amer], mI-gru-t(u-)ree [Brit]
  1. Used of animals that move seasonally
    "migratory birds"
     
  2. Habitually moving from place to place especially in search of seasonal work
    "migratory workers";
    - migrant

See also: unsettled

Antonym: nonmigratory

Encyclopedia: Migratory