Sorry, no online dictionaries contain the exact phrase opt-in email advertising.
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Reverse dictionary results:
1. unsubscribe
 2. entry
3. active
4. referral
5. acceptance
6. option
7. participation
8. tick
9. spam
10. pgp
 11. announcement
12. billboard
13. billposter
14. direct mail
15. junk mail
16. mailer
17. mailing
18. shopper
19. sign
20. slogan
 21. broadcast
22. imo
23. mail
24. memo
25. message
26. print
27. sender
28. shout
29. shouted
30. shouting
 31. star
32. telex
33. type
34. url
35. rate card
36. advertising campaign
37. billsticker
38. biz
39. bode
40. box

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You can look up the words in the phrase individually using these links:   opt-in ?   email ?   advertising ?
(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
opt-*to search for words beginning with opt-, or
*singto search for words ending with sing
You might also try these searches: Google, News, Images, Wikipedia, Reddit, Scrabble



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