different between efficiency vs efficacious

English

Etymology

From Latin efficientia.

Pronunciation

• IPA^(key): /??f??n?si/

Noun

efficiency (countable and uncountable, plural efficiencies)

1. The extent to which time is well used for the intended task.

   Antonyms: inefficiency, wastefulness
2. (dated) The quality of producing an effect or effects.
   • 1594, Richard Hooker, Of the Lawes of Ecclesiastical Politie

     The manner of this divine efficiency being far above us.

3. The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended.

   Antonyms: inefficiency, wastefulness

4. (US) A one-room apartment.

   Synonyms: efficiency apartment, (UK, Ireland) bedsit

Hyponyms

Derived terms

Related terms

Translations

References

• efficiency on Wikipedia.Wikipedia

English

Etymology

From Old French efficacieux, from Latin effic?x (“efficacious”) +? -ous, from efficere (“to effect, to accomplish”); see effect.

Pronunciation

• IPA^(key): /?f.?.?ke?.??s/

  Rhymes: -e???s

Adjective

efficacious (comparative more efficacious, superlative most efficacious)

1. (formal) Effective; possessing efficacy. [from 1520s]

   Synonym: effective

   Antonym: inefficacious

Related terms

Translations

Further reading

• efficacious in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• efficacious in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• “efficacious”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.