Sorry, no online dictionaries contain the exact phrase opt-in advertising.
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Reverse dictionary results:
1. acceptance
2. entry
3. option
4. participation
5. tick
6. unsubscribe
7. accession
8. active
9. choice
10. opt
11. opt-out
12. optional
13. participants
14. participating
15. participative
16. participatory
17. referral
18. withdraw
19. ad agency
20. adman
21. admass
22. ads
23. advertise
24. advertisement
25. advertisements
26. advertiser
27. advertisers
28. advertising agency
29. adverts
30. advocacy
31. adware
32. announcement
33. announcements
34. avail
35. availing
36. badge
37. bait and switch
38. ballyhoo
39. banner
40. bill

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You can look up the words in the phrase individually using these links:   opt-in ?   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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