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Otto cycle

noun, Thermodynamics.
an idealization of the thermodynamic cycle of the internal combustion engine with air as the working substance: intake of air at atmospheric pressure, then adiabatic compression, then ignition with an increase of pressure and temperature at constant volume, then adiabatic expansion and performance of work, then a drop to atmospheric pressure at constant volume and a rejection of heat to the environment, then the exhaust of air at constant pressure.
Origin of Otto cycle
1885-90; named after Nikolaus August Otto, 1832-91, German engineer and inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Otto cycle

an engine cycle used on four-stroke petrol engines (Otto engines) in which, ideally, combustion and rejection of heat both take place at constant volume Compare diesel cycle
Word Origin
C19: named after Nikolaus August Otto (1832–91), German engineer
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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