Sorry, no online dictionaries contain the exact phrase principle of additionality.
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Reverse dictionary results:
1. adjunctive
2. admixture
3. afterthought
4. ascititious
5. booster
6. booster dose
7. booster shot
8. check
9. checking
10. confirmation
11. coprocessor
12. countersign
13. diminishing return
14. extra
15. intermixture
16. mixture
17. moiety
18. nucleus
19. recall dose
20. substantiation
21. verification
22. amortization
23. equity
24. complementarity
25. complementary
26. acceptability
27. accountability
28. addendum
29. audit
30. benefits
31. burden
32. cooperation
33. liability
34. reduction
35. removal
36. additional
37. armageddon
38. bene
39. cba
40. certifications

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