Plural of migration: the movement of people, animals, or birds from one place to another, often seasonally or to escape danger.
From Latin 'migrare' (to move, wander). Originally described the seasonal movement of birds and herds, later applied to human movement.
Arctic terns migrate 44,000 miles yearly—the longest journey of any animal—yet we use the same word for humans moving to a new city; the word 'migration' covers everything from butterfly wings to human history.
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