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There are 14 words beginning with EFFIC

EFFICACY	• efficacy n. Ability to produce a desired effect under ideal testing conditions. • efficacy n. Degree of ability to produce a desired effect; effectiveness. • EFFICACY n. effectiveness.
EFFICIENT	• efficient adj. Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use… • efficient adj. Expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful… • efficient adj. Causing effects, producing results; bringing into being; initiating change (rare except in philosophical…
EFFICACIES	• efficacies n. Plural of efficacy. • EFFICACY n. effectiveness.
EFFICACITY	• efficacity n. Efficacy. • EFFICACITY n. the state of being efficacious.
EFFICIENCE	• efficience n. Archaic form of efficiency. • EFFICIENCE n. (archaic) efficiency, also EFFICIENCY.
EFFICIENCY	• efficiency n. The extent to which time is well used for the intended task. • efficiency n. (Dated) The quality of producing an effect or effects. • efficiency n. The extent to which a resource is used for the intended purpose; the ratio of useful work to energy expended.
EFFICIENTS	• efficients n. Plural of efficient. • EFFICIENT n. a trained soldier, esp. one volunteering for service.
EFFICACIOUS	• efficacious adj. (Formal) Effective; possessing efficacy. • EFFICACIOUS adj. having the power to produce a desired effect.
EFFICIENCES	• efficiences n. Plural of efficience. • EFFICIENCE n. (archaic) efficiency, also EFFICIENCY.
EFFICIENTLY	• efficiently adv. In an efficient manner. • EFFICIENT adv. capable of doing what may be required.
EFFICACITIES	• efficacities n. Plural of efficacity. • EFFICACITY n. the state of being efficacious.
EFFICIENCIES	• efficiencies n. Plural of efficiency. • EFFICIENCY n. the quality of being efficient, also EFFICIENCE.
EFFICACIOUSLY	• efficaciously adv. In an efficacious manner. • EFFICACIOUS adv. having the power to produce a desired effect.
EFFICACIOUSNESS	• efficaciousness n. Quality of being efficacious. • EFFICACIOUS n. having the power to produce a desired effect.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 20 words
Scrabble in French: 11 words
Scrabble in Spanish: no word
Scrabble in Italian: 24 words
Scrabble in German: no word
Scrabble in Romanian: no word

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