What do a.m. and p.m. stand for?


[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.
Origin of autorotation
1915-20; auto-1 + rotation
Related forms
autorotational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
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
Cite This Source

Word of the Day

Difficulty index for autorotation

Few English speakers likely know this word

Word Value for autorotation

Scrabble Words With Friends