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angle of advance

noun engineering
  1. the angle in excess of 90° that a steam-engine valve gear is in advance of the crank
  2. the angle between the point of ignition and bottom dead-centre in a spark-ignition engine
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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