n. | 1. | The act of migrating. |
Noun | 1. | migration - the movement of persons from one country or locality to another |
2. | migration - a group of people migrating together (especially in some given time period) | |
3. | migration - (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule | |
4. | migration - the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding |