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WordReference Random House Unabridged Dictionary of American English © 2024two-cy•cle (to̅o̅′sī′kəl),USA pronunciation adj. - Automotive, Mechanical Engineeringnoting or pertaining to an internal-combustion engine in which two strokes are required to complete a cycle (two-stroke cycle), one to admit and compress air or an air-fuel mixture and one to ignite fuel, do work, and scavenge the cylinder. Cf. four-cycle.
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