Sorry, no online dictionaries contain the exact phrase valid proposition.
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Reverse dictionary results:
1. lemma
 2. affirmative
3. prove
4. ratiocination
5. vote
6. rule
7. paradox
8. passage
9. true
10. affirm
 11. admit
12. antinomy
13. assumptive
14. bad
15. baf
16. baseless
17. bsd
18. cogent
19. credence
20. defend
 21. demurrer
22. egoism
23. equity
24. establish
25. explain
26. explaining
27. force
28. hold
29. important
30. invalid
 31. legitimate
32. logic
33. logical
34. logicality
35. logicalness
36. make
37. point
38. reason
39. receive
40. recognition

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