compression ratio

noun Automotive.
the ratio of the cylinder volume enclosed by the piston at its outermost position to the volume enclosed by it at its innermost position.

Origin:
1905–10

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World English Dictionary
compression ratio
 
n
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

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Example sentences
Mazda's mad scientists say they spent a decade studying high compression ratio
  powerplants.
If engines were designed to burn ethanol instead of gasoline, they could use a
  higher compression ratio.
Calculate problems using the formula for compression ratio.
Some higher compression ratio heavy-duty lean burn engines include an
  additional feedback for knock detection.
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