Don't confuse "efficacy" with "efficiency".
Source: tatoeba (538449)
Efficacy
//ˈɛf.ɪ.kə.si//
Synonyms for "efficacy" (34 found)
Ranked by relevance and common usage.
Closest matches (7)
Strong matches (10)
Related words (17)
Related word relations
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
More general
4 entriesAntonyms
1 entriesSynonyms
1 entriesRelated terms
12 entriesderived
6 entriesis a
1 entriesrelated to
11 entriesTranslations
45 translations across 26 languages.
Ancient Greek
1 entries- δρᾶσις noun (ability to produce effect)
Azerbaijani
2 entries- səmərə noun (ability to produce effect)
- təsirlilik noun (ability to produce effect)
Bulgarian
1 entries- де́йственост noun (ability to produce effect)
Catalan
1 entries- eficàcia noun (ability to produce effect)
Chinese Mandarin
4 entries- 功效 noun (ability to produce effect)
- 效力 noun (ability to produce effect)
- 效能 noun (ability to produce effect)
- 效驗 /效验 noun (ability to produce effect)
Czech
2 entries- efektivnost noun (ability to produce effect)
- účinnost noun (ability to produce effect)
Dutch
1 entries- doeltreffendheid noun (ability to produce effect)
Esperanto
1 entries- efikeco noun (ability to produce effect)
Finnish
1 entries- tehokkuus noun (ability to produce effect)
French
2 entries- efficacité noun (ability to produce effect)
- efficience noun (ability to produce effect)
German
4 entries- Wirkfähigkeit noun (ability to produce effect)
- Wirksamkeit noun (ability to produce effect)
- Wirkungsfähigkeit noun (ability to produce effect)
- Wirkungsgrad noun (degree of ability to produce a desired effect)
Hungarian
1 entries- hatékonyság noun (ability to produce effect)
Indonesian
4 entries- efikasi noun (ability to produce effect)
- keampuhan noun (ability to produce effect)
- kemanjuran noun (ability to produce effect)
- khasiat noun (ability to produce effect)
Interlingua
1 entries- efficacia noun (ability to produce effect)
Italian
1 entries- efficacia noun (ability to produce effect)
Japanese
1 entries- 有効性 noun (ability to produce effect)
Latin
1 entries- efficacitas noun (ability to produce effect)
Polish
2 entries- efektywność noun (ability to produce effect)
- skuteczność noun (ability to produce effect)
Portuguese
1 entries- eficácia noun (ability to produce effect)
Romanian
1 entries- eficacitate noun (ability to produce effect)
Russian
2 entries- де́йственность noun (ability to produce effect)
- эффекти́вность noun (ability to produce effect)
Slovak
1 entries- efektívnosť noun (ability to produce effect)
Slovene
1 entries- učinkovitost noun (ability to produce effect)
Spanish
1 entries- eficacia noun (ability to produce effect)
Swedish
1 entries- effektivitet noun (ability to produce effect)
Ukrainian
2 entries- діє́вість noun (ability to produce effect)
- ефекти́вність noun (ability to produce effect)
Sample sentences
14 total sentences available.
The aim of this study was to evaluate the efficacy of acupuncture in the treatment of SAR through a randomized controlled trail.
Source: tatoeba (4264776)
This practice is of dubious efficacy.
Source: tatoeba (6049469)
Testing a vaccine for safety and efficacy will take 12 to 18 months or more.
Source: tatoeba (8592362)
Showing 4 of 14 available sentences.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.