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There are 19 words containing EFFICIEN

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…
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.
COEFFICIENT	• coefficient adj. Cooperating. • coefficient n. (Mathematics) A constant by which an algebraic term is multiplied. • coefficient n. A number, value, or item that serves as a measure of some property or characteristic.
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.
INEFFICIENT	• inefficient adj. Not efficient; not producing the effect intended or desired; inefficacious. • inefficient adj. Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing. • inefficient n. A person who cannot or does not work efficiently.
COEFFICIENTS	• coefficients n. Plural of coefficient. • coëfficients n. Plural of coëfficient. • COEFFICIENT n. any of the factors of a product considered in relation to a specific factor.
EFFICIENCIES	• efficiencies n. Plural of efficiency. • EFFICIENCY n. the quality of being efficient, also EFFICIENCE.
INEFFICIENCY	• inefficiency n. Lack of efficiency or effectiveness. • INEFFICIENCY n. the state of being inefficient.
INEFFICIENTS	• inefficients n. Plural of inefficient. • INEFFICIENT n. one who is not efficient.
INEFFICIENTLY	• inefficiently adv. In an inefficient manner. • INEFFICIENT adv. not efficient.
HYPEREFFICIENT	• hyperefficient adj. Extremely efficient. • HYPEREFFICIENT adj. excessively efficient.
INEFFICIENCIES	• inefficiencies n. Plural of inefficiency. • INEFFICIENCY n. the state of being inefficient.
SUPEREFFICIENT	• superefficient adj. Very efficient. • SUPEREFFICIENT adj. extremely efficient.
ULTRAEFFICIENT	• ultraefficient adj. Extremely efficient; of utmost efficiency. • ULTRAEFFICIENT adj. extremely efficient.
HYPEREFFICIENCY	Sorry, definition not available.
SUPEREFFICIENCY	• superefficiency n. The quality of being superefficient. • SUPEREFFICIENCY n. the state of being superefficient.

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.

See this list for:

English Wiktionary: 80 words
Scrabble in French: 12 words
Scrabble in Spanish: no word
Scrabble in Italian: 23 words
Scrabble in German: no word
Scrabble in Romanian: no word

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