verb
migrate denotes a moving from one region or country to another and may imply, of people, intention to settle in a new land, or, of animals, a periodic movement influenced by climate, food supply, etc.; emigrate and immigrate are used only of people, emigrate specifically denoting the leaving of a country to settle in another, and immigrate, the coming into the new country to settle
See migrate in Webster's New World Roget's A-Z Thesaurus II
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