Definitions for "VORTICITY"
The amount of rotation, or spin, of the air - also defined as circulation per unit area. Cyclonic vorticity (counter-clockwise spin) is essential for the creation of upper air divergence, rising air, and the development of surface low pressure systems.
the state of a fluid in vortical motion; a measure of vortical motion, especially a vector measure of local rotation in a fluid flow
the tendency of a moving gas or liquid to rotate around an axis, forming a vortex.