efficaciousness
/ˌɛfɪˈkeɪʃəsnəs/
noun
- The quality of being able to produce the intended result; effectiveness.
- The efficaciousness of the new teaching method was proven by higher test scores.
- Doctors studied the efficaciousness of the vaccine in preventing the disease.
- The team doubted the efficaciousness of the plan, but it worked perfectly.
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