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thermal efficiency

noun, Thermodynamics.
the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.
Origin of thermal efficiency
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thermal-efficiency

thermal efficiency

the ratio of the work done by a heat engine to the energy supplied to it Compare efficiency
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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Contemporary definitions for thermal-efficiency

in thermodynamics, the amount of work done by a heat engine divided by the thermal energy required to drive it; also, the ratio of the work done an engine to the work due to the heat supplied to it's 21st Century Lexicon
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