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  1. Efficiency Definition & Meaning - Merriam-Webster

  2. EFFICIENCY | English meaning - Cambridge Dictionary

  3. EFFICIENCY | definition in the Cambridge English Dictionary

  4. Efficiency - Wikipedia

  5. efficiency noun - Definition, pictures, pronunciation and usage …

  6. EFFICIENCY definition and meaning | Collins English Dictionary

  7. Efficiency - Definition, Meaning & Synonyms - Vocabulary.com

  8. Efficiency Definition & Meaning | Britannica Dictionary

  9. EFFICIENCY - Meaning & Translations | Collins English Dictionary

  10. EFFICIENCY Definition & Meaning - Dictionary.com