compression ratio

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Compression ratio is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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