effectiveness

/IH0 F EH1 K T IH0 V N AH0 S/
noun
  1. 1

    The property of being effective, of achieving results.

    โ€œThe effectiveness of the drug was well established.โ€

  2. 2

    The capacity or potential for achieving results.

  3. 3

    The degree to which something achieves results.

    โ€œHe questioned the effectiveness of the treatment.โ€

Source: https://en.wiktionary.org/wiki/effectiveness