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From: Webster's Revised Unabridged Dictionary (1913)

 Di·rect-act·ing a. Mach. Acting directly, as one part upon another, without the intervention of other working parts.
 Direct-acting steam engine, one in which motion is transmitted to the crank without the intervention of a beam or lever; -- also called direct-action steam engine.
 Direct-acting steam pump, one in which the steam piston rod is directly connected with the pump rod; -- also called direct-action steam pump.