Sorry, no online dictionaries contain the exact phrase be valid indefinitely.
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Reverse dictionary results:
1. eternal
 2. perpetual
3. point
4. establish
5. ageless
6. eternize
7. everlasting
8. in perpetuity
9. many
10. one
 11. permanent
12. persistent
13. impermanence
14. impermanency
15. perpetuate
16. perpetuated
17. recurring decimal
18. standing
19. subsequent
20. adamant
 21. bead
22. beads
23. blind
24. coeternal
25. continually
26. deal
27. demulsify
28. draw
29. east
30. floating
 31. fund
32. immortalize
33. inherent
34. moan
35. moaning
36. obscureness
37. obscurity
38. ongoing
39. rheostat
40. standing order

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You can look up the words in the phrase individually using these links:   be ?   valid ?   indefinitely ?
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