• To perform a work or labour; to exert power or strength, physical or mechanical; to act.
  • To produce an appropriate physical effect; to issue in the result designed by nature; especially to take appropriate effect on the human system.
  • To act or produce effect on the mind; to exert moral power or influence.
  • To perform some manual act upon a human body in a methodical manner, and usually with instruments, with a view to restore soundness or health, as in amputation, lithotomy, etc.
  • To deal in stocks or any commodity with a view to speculative profits.
  • To produce, as an effect; to cause.
  • To put into, or to continue in, operation or activity; to work.


  • From Latin operātus, past participle of operārī, from opus, operis.

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