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| four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | |||
| four-stroke cycle engine; four-stroke engine | |||
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| four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | |||
| four-stroke cycle engine; four-stroke engine | |||