Sorry, no online dictionaries contain the exact phrase duration of validity.
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Reverse dictionary results:
1. expiry
 2. period
3. tenure
4. value
5. stand
6. sustain
7. age
8. ancient
9. aspect
10. certificate
 11. chronic
12. continuity
13. deadlines
14. dimension
15. dots
16. doy
17. dpt
18. durability
19. endurance
20. extend
 21. extended
22. give
23. hour
24. infinite
25. instantaneous
26. lag
27. last
28. lease
29. length
30. life
 31. lifespan
32. live
33. long-term
34. maximal
35. meter
36. moment
37. old
38. out
39. permanence
40. perpetual

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You can look up the words in the phrase individually using these links:   duration ?   of ?   validity ?
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