from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Physics A measure of the rate of rotational spin in a fluid.
- n. Meteorology A measure of the spin of an air mass such as a low- or high-pressure weather system.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A property of a fluid related to local angular rotation
from The Century Dictionary and Cyclopedia
- n. The state or condition of the rotating portions of a fluid in which vortex-motion occurs.
vortex + -ity (Wiktionary)