entrainment

(chemical engineering) A process in which the liquid boils so violently that suspended droplets of liquid are carried in the escaping vapor.
(hydrology) The pickup and movement of sediment as bed load or in suspension by current flow.
(meteorology) The mixing of environmental air into a preexisting organized air current so that the environmental air becomes part of the current.
(oceanography) The transfer of fluid by friction from one water mass to another, usually occurring between currents moving in respect to each other.

1. In geomorphology, the picking up and setting into motion of particles, either by wind, water, or ice. The main entrainment forces are provided by impact, lift force, and turbulence. Collision between particles is an important process where the lifting agent is air.

2. In meteorology, the incorporation of buoyant air into a cloud.