migration

英 [maɪ'greɪʃ(ə)n] 美[maɪ'ɡreʃən]

• n. 迁移；移民；移动

1. the movement of persons from one country or locality to another

2. a group of people migrating together (especially in some given time period)

3. (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule

4. the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding