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

Category: General

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

Category: General

3.Definition: the movement of persons from one country or locality to another

Category: General

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

Category: General