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We have one entry that includes the term four-stroke.
four-stroke cycle
noun: a cycle in which air or an explosive mixture is drawn into the cylinder of an internal-combustion engine on a suction stroke, is compressed and ignited on a compression stroke, burns and performs useful work on an expansion stroke, and expels the products of combustion on an exhaust or scavenging stroke
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Merriam-Webster unabridged
