Sorry, no online dictionaries contain the exact phrase occuring only once.
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Reverse dictionary results:
1. semelincident
 2. one-off
3. one-shot
4. onetime
5. one-time
6. hapax
7. nonce word
8. fossil
9. nonce
10. one-night stand
 11. yearly
12. monocarpic
13. monogamy
14. primiparous
15. alone
16. monogamous
17. simply
18. cdr
19. grilse
20. hapax legomenon
 21. subroutine
22. uniquely
23. cd-r
24. cd-wo
25. compact disc recordable
26. compact disc write-once
27. hapaxanthous
28. semelparous
29. unipara
30. quotidian
 31. carbonyl
32. cadenza
33. nepheline
34. biweekly
35. ever
36. every
37. irrational
38. repeat
39. diurnal
40. immediately

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You can look up the words in the phrase individually using these links:   occuring ?   only ?   once ?
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