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

autorotational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autorotation (ˌɔːtəʊrəʊˈteɪʃən)
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
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Example sentences
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.
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