Sorry, no online dictionaries contain the exact phrase semiperfect numbers.
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Reverse dictionary results:
1. deficient
 2. imperfect
3. flawed
4. faulty
5. incomplete
6. abound
7. abundance
8. accounts
9. accumulator
10. actinon
 11. acts
12. actual
13. add
14. added
15. addend
16. adder
17. addition
18. additional
19. adequacy
20. adequate
 21. adf
22. alewife
23. algebraic
24. algebraic number
25. algebraical
26. almanac
27. alphanumeric
28. alternation
29. amount
30. amounts
 31. amphidiploid
32. amplitude
33. analog computer
34. arabic
35. area code
36. argument
37. arithmetic
38. arithmetic progression
39. array
40. articulate

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You can look up the words in the phrase individually using these links:   semiperfect ?   numbers ?
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