the ratio of the cylinder volume enclosed by the piston at its outermost position to the volume enclosed by it at its innermost position.
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- compression cyanosis,
- compression ignition,
- compression molding,
- compression paralysis,
- compression syndrome,
- compression wave,
- compression-ignition engine,
Origin of compression ratio
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the ratio of the volume enclosed by the cylinder of an internal-combustion engine at the beginning of the compression stroke to the volume enclosed at the end of it
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