Definition of self-acting in English:

self-acting

adjective

archaic
  • (of a machine or operation) acting without external influence or control; automatic.

    ‘this being a self-acting incline the empty trucks were dragged up by the full ones’
    • ‘Precision manufacture of interchangeable parts led to greater and greater division of labor and the invention of self-acting machines that could be operated by workers with less training and experience than traditional craftsmen.’
    • ‘After 1825, when the self-acting mule spinner automated the process, spinning 100 pounds of cotton took 135 hours.’

Pronunciation

self-acting

/sɛlfˈaktɪŋ/