Hypertext Webster Gateway: "migration"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Migration \Mi*gra"tion\, n. [L. migratio: cf. F. migration.]
The act of migrating.
From WordNet (r) 1.7 (wn)
migration
n 1: the movement of a group of people from one country or
locality to another
2: the periodic passage from one region to another for feeding
or breeding
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