Sorry, no online dictionaries contain the exact phrase efficiency study.
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Reverse dictionary results:
1. audit
 2. economics
3. economy
4. energy
5. instrumentation
6. set
7. shape
8. capable
9. competence
10. cost-effectiveness
 11. cruise
12. cruising
13. deed
14. dispatch
15. duty
16. effect
17. effected
18. effecting
19. effective
20. effectively
 21. effectiveness
22. efficacy
23. efficient
24. exercise
25. expedite
26. field trial
27. fine
28. fines
29. fit
30. fitted
 31. force
32. gun
33. guns
34. inefficiency
35. man
36. mileage
37. order
38. peak
39. performance
40. potency

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You can look up the words in the phrase individually using these links:   efficiency ?   study ?
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