Sorry, no online dictionaries contain the exact phrase unusual occurence.
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Reverse dictionary results:
1. anomaly
 2. incident
3. irregularity
4. exception
5. occurrence
6. incidental
7. incidental expense
8. singularity
9. by the by
10. circumstantial
 11. incidentally
12. incidentals
13. rivality
14. apropos
15. circumstantially
16. collateral
17. en passant
18. indirect
19. prematureness
20. adhocism
 21. adventitiously
22. determinably
23. exceptious
24. exotic
25. finality
26. independent
27. knowledgability
28. peculiar
29. prescriptivity
30. singular
 31. singularist
32. soleness
33. tolerance
34. vicarious
35. accurateness
36. by the way
37. case-by-case
38. counterfactuality

You can look up the words in the phrase individually using these links:   unusual ?   occurence ?
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