noun
Meaning 1
Quality of being efficacious.
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Standard Lemma guide
efficaciousness
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
noun
Meaning 2
capacity or power to produce a desired effect
Definition source: Princeton WordNet 3.0
Examples
- concern about the safety and efficacy of the vaccine
Meaning relationships
Synonyms: efficacy
Antonyms: none provided
Broader terms: effectiveness, effectivity, effectualness, effectuality
History
Etymology
From efficacious + -ness.