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Efficiency Definition & Meaning - Merriam-Webster
Efficiency - Wikipedia
EFFICIENCY Definition & Meaning | Dictionary.com
EFFICIENCY | English meaning - Cambridge Dictionary
EFFICIENCY | definition in the Cambridge English Dictionary
EFFICIENCY | meaning - Cambridge Learner's Dictionary
Efficiency Definition & Meaning | Britannica Dictionary
efficiency noun - Definition, pictures, pronunciation and usage …
Efficiency - Definition, Meaning & Synonyms | Vocabulary.com
EFFICIENCY definition and meaning | Collins English Dictionary