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We found 67 dictionaries with English definitions that include the word efficiency:
Click on the first link on a line below to go directly to a page where "efficiency" is defined.

General (28 matching dictionaries)

1. efficiency: Merriam-Webster.com [home, info]
2. efficiency: Oxford Learner's Dictionaries [home, info]
3. efficiency: American Heritage Dictionary of the English Language [home, info]
4. efficiency: Collins English Dictionary [home, info]
5. efficiency: Vocabulary.com [home, info]
6. efficiency: Macmillan Dictionary [home, info]
7. Efficiency, efficiency: Wordnik [home, info]
8. efficiency: Cambridge Advanced Learner's Dictionary [home, info]
9. efficiency: Wiktionary [home, info]
10. efficiency: Webster's New World College Dictionary, 4th Ed. [home, info]
11. efficiency: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. efficiency: Infoplease Dictionary [home, info]
13. efficiency: Dictionary.com [home, info]
14. efficiency: UltraLingua English Dictionary [home, info]
15. efficiency: Cambridge Dictionary of American English [home, info]
16. Efficiency (Network Science), Efficiency (basketball), Efficiency (disambiguation), Efficiency (economics), Efficiency (finance), Efficiency (network science), Efficiency (statistics), Efficiency: Wikipedia, the Free Encyclopedia [home, info]
17. Efficiency: Online Plain Text English Dictionary [home, info]
18. efficiency: Rhymezone [home, info]
19. efficiency, efficiency: AllWords.com Multi-Lingual Dictionary [home, info]
20. efficiency: Webster's 1828 Dictionary [home, info]
21. efficiency: Stammtisch Beau Fleuve Acronyms [home, info]
22. efficiency: Free Dictionary [home, info]
23. efficiency: Mnemonic Dictionary [home, info]
24. efficiency: WordNet 1.7 Vocabulary Helper [home, info]
25. efficiency: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. efficiency: Dictionary/thesaurus [home, info]

Business (16 matching dictionaries)

27. Efficiency: MoneyGlossary.com [home, info]
28. efficiency: Travel Industry Dictionary [home, info]
29. efficiency: INVESTORWORDS [home, info]
30. EFFICIENCY: Accounting Glossary [home, info]
31. Efficiency: Bloomberg Financial Glossary [home, info]
32. efficiency: Glossary of research economics [home, info]
33. Efficiency: Construction Term Glossary [home, info]
34. Efficiency: FACS Journalist's Guide to Economic Terms [home, info]
35. Efficiency: Deardorff's Glossary of International Economics [home, info]
36. Efficiency: Futures and Options Market Terminology [home, info]
37. Efficiency: Investopedia [home, info]
38. Efficiency: Broadcast Media Terms [home, info]
39. efficiency: Legal dictionary [home, info]
40. Efficiency: Financial dictionary [home, info]
41. Efficiency: Accounting, Business Studies and Economics Dictionary [home, info]
42. efficiency: BusinessDictionary.com [home, info]

Computing (3 matching dictionaries)

43. Efficiency: Cybernetics and Systems [home, info]
44. efficiency: Dictionary of Algorithms and Data Structures [home, info]
45. Efficiency (statistics), efficiency: Encyclopedia [home, info]

Medicine (4 matching dictionaries)

46. Efficiency: Medical Dictionary [home, info]
47. efficiency: online medical dictionary [home, info]
48. Efficiency: Glossary of Medical Education Terms [home, info]
49. efficiency: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

50. efficiency: A Brief Critical Dictionary of Education [home, info]

Science (4 matching dictionaries)

51. Efficiency: Eric Weisstein's World of Physics [home, info]
52. efficiency: Game Theory Dictionary [home, info]
53. efficiency: PlanetMath Encyclopedia [home, info]
54. Efficiency: Fundamental Statistics for the Behavioral Sciences [home, info]

Tech (11 matching dictionaries)

55. efficiency: Electronics [home, info]
56. efficiency: NATURAL RESOURCES DEFENSE COUNCIL [home, info]
57. Efficiency: AUTOMOTIVE TERMS [home, info]
58. Efficiency: Dairy Glossary [home, info]
59. EFFICIENCY: Energy Terms [home, info]
60. EFFICIENCY: Glossary of Common Hearth and Heating Terms [home, info]
61. Efficiency: Glossary of video terms [home, info]
62. EFFICIENCY: Lake and Water Word Glossary [home, info]
63. Efficiency: PUMP AND SEAL TERMS [home, info]
64. Efficiency: Glossary of Energy Terms [home, info]
65. Efficiency: Sweetwater Music [home, info]

(Note: See efficiencys for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (efficiency) ▸ noun:  skillfulness in avoiding wasted time and effort ("She did the work with great efficiency") ▸ noun:  the ratio of the output to the input of any system ▸ Also see efficiencys ▸ Words similar to efficiency ▸ Usage examples for efficiency ▸ Idioms related to efficiency (New!) ▸ Popular adjectives describing efficiency ▸ Words that often appear near efficiency ▸ Rhymes of efficiency ▸ Invented words related to efficiency