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DictionarySeestrokepower stroke
power stroke[′pau̇·ər ‚strōk] (mechanical engineering) The stroke in an engine during which pressure is applied to the piston by expanding steam or gases. power strokeThe stroke in the operating cycle of a reciprocating engine in which both the inlet and the exhaust valves are closed, the fuel-air mixture has been ignited and burned, and the piston is being forced downward by expanding gases. See four-stroke cycle. |