Sorry, no online dictionaries contain the exact phrase happened at least once.
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Reverse dictionary results:
1. future
 2. town
3. ever
4. less
5. fewer
6. lower
7. minus
8. under
9. instantly
10. below
 11. ricochet
12. never
13. still
14. then
15. now
16. between
17. after
18. again
19. ago
20. history
 21. new
22. repeated
23. came
24. come
25. coming
26. get
27. memory
28. nucleosynthesis
29. past
30. recent
 31. today
32. here
33. was
34. ancient
35. been
36. happen
37. happening
38. happens
39. knowledge
40. known

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You can look up the words in the phrase individually using these links:   happened ?   at ?   least ?   once ?
(A question mark next to a word above means that we couldn't find it, but clicking the word might provide spelling suggestions.)

Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
happ*to search for words beginning with happ, or
*onceto search for words ending with once
You might also try these searches: Google, News, Images, Wikipedia, Reddit, Scrabble



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