Sorry, no online dictionaries contain the exact phrase authentication code.
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Reverse dictionary results:
1. password
 2. certification
3. probate
4. seal
5. testimony
6. verification
7. aaa
8. indenture
9. proof
10. verfication
 11. leap
12. bin
13. bins
14. change control
15. dispensation
16. hippocratic oath
17. reference
18. referenced
19. squawk
20. squawking
 21. omerta
22. aba transit number
23. abjuration
24. acknowledgment
25. adjuration
26. administration
27. administrator
28. age
29. allocatur
30. allowance
 31. approach
32. approaching
33. attest
34. bank identification number
35. bill of indictment
36. bind
37. bookplate
38. caption
39. challenge
40. clearance

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You can look up the words in the phrase individually using these links:   authentication ?   code ?
(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
auth*to search for words beginning with auth, or
*codeto search for words ending with code
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