Definition of "entrainment"

Any of several processes in which a solid or liquid is put into motion by a fluid.

1. The carrying away of droplets of liquid during violent boiling  examples

2. The movement of sediment in a stream of water or in a glacier  examples

3. The mixing of air currents  examples

4. The mixing of out flowing river water and underlying seawater.  examples

(biology) The alignment of an organism's circadian rhythm to an external rhythm in its environment