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autorotation

[aw-toh-roh-tey-shuh n]
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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.
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Origin of autorotation

First recorded in 1915–20; auto-1 + rotation
Related formsau·to·ro·ta·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for autorotation

autorotation

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
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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