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There are 7 ten-letter words beginning with EFFI

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.
EFFIERCING	• EFFIERCE v. (Spenser) to make fierce, also ENFIERCE.
EFFIGURATE	• effigurate adj. (Botany, lichenology) Having a definite (lobed) shape; not effuse. • EFFIGURATE adj. having a definite shape.

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: 9 words
Scrabble in French: 21 words
Scrabble in Spanish: no word
Scrabble in Italian: 27 words
Scrabble in German: no word
Scrabble in Romanian: no word

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