Sorry, no online dictionaries contain the exact phrase plus one is the loneliest number.

Reverse dictionary results:
1. number off
 2. phase rule
3. continued fraction
4. halve
5. clientage
6. lonely
7. asset
8. more
9. nine
10. over
 11. raise
12. deposit
13. edge
14. interest
15. eight
16. most
17. positive
18. sum
19. ace
20. etcetera
 21. extra
22. redraft
23. theory
24. wth
25. advantage
26. cross
27. gain
28. give
29. parlay
30. sate
 31. term
32. any
33. score
34. two
35. addition
36. deuce
37. encore
38. ninth
39. par
40. short

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You can look up the words in the phrase individually using these links:   plus ?   one ?   is ?   the ?   loneliest ?   number ?
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