Sorry, no online dictionaries contain the exact phrase opt-in e-mail advertising.
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Reverse dictionary results:
1. acceptance
 2. entry
3. option
4. participation
5. tick
6. unsubscribe
7. mailing
8. address
9. correspondence
10. courier
 11. e-mails
12. electronic
13. electronically
14. electronics
15. email
16. emails
17. fax
18. mail
19. mailto
20. message
 21. messaging
22. online
23. post
24. postage
25. postal
26. send
27. sent
28. snail mail
29. stamp
30. url
 31. electrónico
32. accession
33. active
34. choice
35. opt
36. opt-out
37. optional
38. participants
39. participating
40. participative

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You can look up the words in the phrase individually using these links:   opt-in ?   e-mail ?   advertising ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
opt-*to search for words beginning with opt-, or
*singto search for words ending with sing
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