Sorry, no online dictionaries contain the exact phrase first-order effect.
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Reverse dictionary results:
1. leading
2. premier
3. prime
4. subordinate
5. first-rate
6. first-class
7. leading-edge
8. lower-order
9. prominent
10. second-order
11. top-flight
12. top-notch
13. top-quality
14. world-class
15. a posteriori
16. a priori
17. aberration
18. abolish
19. abortive
20. about
21. abracadabra
22. abrasion
23. absolute
24. accessory
25. accident
26. accomplish
27. accomplishment
28. accordance
29. accordingly
30. accretion
31. ache
32. achieve
33. achieved
34. achieving
35. acoustics
36. act
37. act on
38. act upon
39. actinometer
40. action

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You can look up the words in the phrase individually using these links:   first-order ?   effect ?
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