the act of gyrating; circular or spiral motion; revolution; rotation; whirling.

1605–15; < Late Latin gȳrātiōn- (stem of gȳrātiō). See gyrate, -ion

gyrational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gyration (dʒaɪˈreɪʃən)
1.  the act or process of gyrating; rotation
2.  any one of the whorls of a spiral-shaped shell

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1615, from L.L. gyratum, pp. of gyrare, from L. gyrus "circle" (see gyre). Gyrate (v.) is an 1822 back-formation (implied in gyrated).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The electron's orbit is close to a half circle if the bunch gap is longer than the half period of electron's gyration motion.
He has to explain every last stock market gyration and tell people how to make money off of it.
Gyration versus density data was then plotted for the two mixes.
Before the burst, the gyration is clockwise, corresponding to a vortex core polarization pointing down.
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