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[self-ak-ting] /ˈsɛlfˈæk tɪŋ/
acting by itself; automatic.
Origin of self-acting
First recorded in 1670-80
Related forms
self-action, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for self-acting
Historical Examples
  • It is this which constitutes person, or the self-acting ego.

    Evolution Joseph Le Conte
  • I suppose the machine is not self-acting, and that he knew that before he came here.'

    Roland Cashel Charles James Lever
  • If we are to have self-acting men they must be removed from close control, in labor as well as elsewhere.

    The Holy Earth L. H. Bailey
  • As a self-acting dispenser of gratuitous counsel he was immense.

    Days in the Open Lathan A. Crandall
  • This needle is self-acting, in that it is made to draw its own loop, sinkers being dispensed with.

  • The work of these self-acting muscles is very wonderful indeed.

  • There were no skilled workmen to be had, no self-acting tools, as in our day, and so the first model was only partly successful.

    The Boyhood of Great Inventors A. Fraser Robertson
  • Behind were six fire-flies, well supplied with self-acting lamps, which they kept hidden somewhere under their wings.

    Japanese Fairy World William Elliot Griffis
  • One man turned a handle at the breech, another kept supplying the self-acting cartridge-box.

    In the Track of the Troops R.M. Ballantyne
  • Really, I must get introduced to her, and show her the self-acting fire-extinguisher I have just invented.

    Fighting the Flames R.M. Ballantyne
British Dictionary definitions for self-acting


not requiring an external influence or control to function; automatic
Derived Forms
self-action, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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