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[fawr-sahy-kuh l, fohr-] /ˈfɔrˌsaɪ kəl, ˈfoʊr-/

noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder.
(US & Canadian) relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion Equivalent term (in Britain and certain other countries) four-stroke Compare two-stroke


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