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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.
efficacious formal adj producing, or certain to produce, the intended result. efficaciously adverb with the intended result; successfully. efficaciousness, efficacity or efficacy noun the power of producing an effect; effectiveness.
ETYMOLOGY: 16c: from Latin efficax, efficacis powerful.
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The Chambers Dictionary (13th edition)
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The unrivalled dictionary for word lovers, now in its 13th edition.
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The Chambers Thesaurus
The Chambers Thesaurus (4th Edition) is a veritable treasure-trove, including the greatest selection of alternative words and phrases available in an A to Z format. -
Chambers Biographical Dictionary
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Thoroughly revised and updated for its 9th edition.
Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.
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