Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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compression ratio in an internal-combustion engine, the ratio of the largest to the smallest volume of a cylinder measured at the top and bottom of the piston stroke.
gear ratio the relationship between the speeds of two gears.
price-earnings ratio the ratio of the price of a share of a company's stock to the company's per-share annual earnings, usu. expressed as a single number; P/E ratio.