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Producing or capable of producing a desired effect. See Synonyms at effective.

[From Latin efficāx, efficāc-, from efficere, to effect; see effect.]

ef′fi·ca′cious·ly adv.
ef′fi·ca′cious·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.efficaciousness - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
effectiveness, effectivity, effectuality, effectualness - power to be effective; the quality of being able to bring about an effect
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


The power or capacity to produce a desired result:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Manufacturers in the vein recognitions market continue to focus on the enhancement of the technology's performance and efficaciousness. Cost-effectiveness and Accuracy of Vein Recognition Biometrics to Uphold Market Growth Vein recognition biometrics are relatively more efficient and accurate than the other types of biometric systems and exhibit lower False Acceptance Rate (FAR) and False Rejection Rate (FRR) which is a vital reason behind the surge in the demand for these systems.
Ike in the Igbo language means power while Ire in the Igbo language will imply competence, efficaciousness, efficiency or productiveness.
With viscosity measurement products helping anticipate the efficaciousness of lubricating oil and determine design elements of pipelines, the products tend to fulfill the need for preponderance tribological applications.
Recent meta-analyses and reviews have described NFB's efficaciousness for PTSD (Panisch & Hai, 2018) and for criminal behavior associated with ADHD, schizophrenia, substance use, and psychopathy (Fielenbach, Donkers, Spreen, Visser, & Bogaerts, 2018).
Robinson's paper focuses on the argument that epiphenomenalism not being able to explain the link between pleasure and efficaciousness as being no worse than interactionism not being able to explain the causation of physical behaviour by nonphysical sensations, or the inability of physicalism to account for the identity of neural states and sensations.
[7] As well as in clinical practice, NIV is used beyond guidepost suggestions, [8] and in spite of concern about the efficaciousness of NIV in sustaining treatment of acute renal failure (ARF) in patients with preexisting diseases other than COPD, NIV is generally regarded as a first-option respiratory therapy in patients with NCFB.
The removal of efficaciousness of Ag-KNC was tested by Malachite Green Oxalate (MGO) dye through batch adsorption and photocatalytic strategies.
The properties of the support material matrix are predominant attributes that control the efficaciousness of the immobilization process.
In addition, the use of disinfectant wipes with a poor germicide activity and composed of a considerable quantity of cellulose or cotton (which can sequestrate quaternary ammonium molecules) may decrease their efficaciousness and serve conversely as means for microbes [31, 32].