Also found in: Thesaurus, Medical, Legal, Encyclopedia.


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.
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


The power or capacity to produce a desired result:
References in periodicals archive ?
The removal of efficaciousness of Ag-KNC was tested by Malachite Green Oxalate (MGO) dye through batch adsorption and photocatalytic strategies.
Firstly, it is necessary to select such international models already tried and measure their impact and efficaciousness on the region in real terms.
The efficaciousness of these symbolisms suggests that what stands at the heart of this is the question of the role of symbolizing in 'good thinking'; that is, the sort of thinking that appears to get some things 'right.
The efficaciousness of prayer does not motivate many devout and committed Catholics to meaningfully participate in political, social, economic, and cultural issues that are not only relevant to living faith in God but also integral to their faith.
In other words, with respect to OOP effects there could be a selection confound; the impact might be a consequence not of the honors OOP but rather of the greater motivation and efficaciousness of those incoming honors students who choose to attend the OOP.
Concurrent with this, UAE's political vision led to the creation of a post for a Minister of State for Youth Affairs in 2016, as well as the setting up of the Emirates Youth Council (headed by the Minister of Youth), two apex entities that provide more cogency to the efficaciousness of youth power at the highest levels.
There is no cause and effect there but it makes one wonder and ponder and reflect about the efficaciousness of going over the heads of a country's wayward political establishment.
The repeated monitoring of children across ages, rather than administration of a single screening instrument at a given age, was found to improve the efficaciousness of the early identification of ASD (Barbaro & Dissanayake, 2010).
Sodium sulfide is widely utilized in dehairing process for leather production owing to its relatively higher effectiveness, efficiency and efficaciousness than other alternatives.
Replication of this study is needed to confirm the efficaciousness of this intervention as well as increasing the duration of use of the iLs Dreampad[TM] pillow beyond the time constraints of this study.
However, to successfully accomplish the accurate estimation of LDH, it is necessary to have the knowledge of factors which negate its diagnostic efficaciousness.