vor·tic·i·ty

[vawr-tis-i-tee]
noun, plural vor·tic·i·ties. Mechanics.
a measure of the circulation of a fluid: a quantity equal to twice the angular momentum of a particle of the fluid around which there is circulation.

Origin:
1890–95; < Latin vortic- (stem of vortex; see vortex) + -ity

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Vorticity is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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Example sentences
The main focus of the researchers has been on the application of the concept of
  potential vorticity tendency.
In reality, it's the clash between warm air and cold air plus vorticity that
  causes storms.
The vertical vorticity is then intensified as it becomes stretched by strong
  updrafts fueled by environmental instability.
There must be a strong updraft and source of vertical vorticity for strong
  mesocyclone and tornado development.
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