GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Direct-acting , a. (Mach.) Acting directly, as one part upon another, without the intervention of other working parts.
   1913 Webster
   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.
   1913 Webster