opt in
verbEtymology From opt + in.
1
To choose to participate in something
opt-in
adjalso spelled opt-inUK /ˈɒptˌɪn/ · US /ˈɑptˌɪn/
Etymology From opt + in.
1
The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising.
- They set up an opt-in mailing list, so that those who wanted the notices could subscribe.
- Antonyms
- opt-out
- Derived terms
- double opt-in