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four-stroking
(automotive) Abnormal operation of a two-stroke internal combustion engine, such that the cylinder only fires every second cycle (like a four-stroke engine). This occurs when the exhaust scavenging and inlet charging leaves a mixture in the cylinder which does not ignite, but needs a second scavenge/charge to produce an adequate mix.
coxless four
(nautical) A boat, used in competitive rowing, having four rowers, each with a single oar / (rowing, especially in plural) A race in which such craft participate
four-door
four-posters
plural of four-poster
four-force
(physics) A four-vector that describes the change in a particle's four-momentum over time.
four-momentum
(physics) A generalization of momentum in four-dimensional spacetime.
four-acceleration
(physics) A four-vector that describes the change in a particle's four-velocity over time