Vorticity definitions

vôr-tĭs'ĭ-tē
A measure of the rate of rotational spin in a fluid.
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A measure of the spin of an air mass such as a low- or high-pressure weather system.
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(mathematics, fluid dynamics) A property of a fluid flow related to local angular rotation; defined as the curl of the flow's velocity field.
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Origin of vorticity

vortex +"Ž -ity