fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

(Latin: to make, to do, to build, to cause, to produce; forming, shaping)

effective
effectively
effectiveness
effectual
effectually
effectualness
effectuate (verb), effectuates; effectuated; effectuating
To cause something to go into action or to accomplish an objective: Harry studied his assignments every day in high school because he wanted to go to the university after graduating, and so he was able to effectuate his desire with his scholarly achievements.
To put into action.
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To put into force or operation.
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effectuation
efficacious (adjective), more efficacious, most efficacious
A reference of something which is capable of producing a desired effect or result: The medicine that the doctor prescribed was supposed to have an efficacious healing of Sam's painful throat.

The politician was rewarded for her efficacious efforts by being elected as governor again.

Pertaining to the power to produce an intended effect.
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efficaciously
efficaciousness
efficacity
efficacy (s) (noun), efficacies (pl)
An ability to produce an intended or desired result: The vaccine that the doctor recommended had the efficacy of being safe and effective in healing Mike's illness.
The power to get the intended result.
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The influence of information to get the intended action.
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Go to this Word A Day Revisited Index
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efficiency
efficient