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[aw-toh-roh-tey-shuh n] /ˌɔ toʊ roʊˈteɪ ʃən/
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.
1915-20; auto-1 + rotation
Related forms
autorotational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for autorotation
  • Gravitational torque on the moon's slightly out of round shape is believed to hold it in autorotation.
  • The certified flight instructor's delayed remedial action and inadequate supervision during a practice autorotation.
  • He released the bucket, and performed an autorotation into a clear area of uneven terrain.
  • The report noted that returning the helicopter to level flight from a turning autorotation did not stop the vibration.
  • In the event of engine failure and autorotation, there may not be enough cyclic control to flare properly for a landing.
  • The in-flight shutdown of the engine could result in a forced autorotation landing or accident.
  • Low-level practice autorotation would be made at the request of the pilot and approval of controllers.
British Dictionary definitions for autorotation


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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