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autorotation

[aw-toh-roh-tey-shuh n] /ˌɔ toʊ roʊˈteɪ ʃən/
noun, Aeronautics
1.
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 of autorotation
1915-1920
1915-20; auto-1 + rotation
Related forms
autorotational, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for autorotation

autorotation

/ˌɔːtəʊrəʊˈteɪʃən/
noun
1.
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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