autorotation

[aw-toh-roh-tey-shuhn]

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noun Aeronautics.

the condition of flight occurring when lift is derived solely from the action of air upon the unpowered rotor of a moving helicopter or autogiro.

Origin:
1915–20; auto-¹ + rotation

Related forms

au·to·ro·ta·tion·al, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Autorotation is always a great word to know.

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maximum deviation of an alternating current from its average value

apparatus with suspended point mass, frictionless thread, constant length and periodic motion

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Collins

World English Dictionary

autorotation (ˌɔːtəʊrəʊˈteɪʃən)

—n
	the continuous rotation of a body in an airflow, such as that of the rotor blades of a helicopter in an unpowered descent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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