four-cycle

four-cycle
/fawr"suy'keuhl, fohr"-/, adj.
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.
[1905-10]

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Universalium. 2010.

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