- Of a selection, 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 advertisement.
- They set up an opt-in mailing list, so that those who wanted the notices could subscribe.
opt + in
(third-person singular simple present opts in, present participle opting in, simple past and past participle opted in)
From opt + in.
opt-in - Computer Definition
To accept some situation or condition ahead of time. For example, to opt-in to an e-mail campaign means that you agree to receive periodic newsletters or information, which may include advertising from the publisher or third parties. An opt-in program implies that you can cancel the service, or "opt-out." A lot of spam is sent out under the guise that, at one point, the user did opt-in for the program, which may or may not be true. See spam and bacn.