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 of compression ratio
First recorded in 1905–10
Words nearby compression ratio
British Dictionary definitions for compression ratio
compression ratio
noun
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