1. opt in - Adjective
2. opt in - Verb
opt in (third-person singular simple present opts in, present participle opting in, simple past and past participle opted in)
To choose to participate in something
opt-in (not comparable)
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.
opt-in
Among those tools, you’ll find Sticky Ads Bar, Mailchimp integration, WhatsApp and Skype features, a Facebook list builder, opt-in popups and even Christmas snow effects just to make the shopping season a little merrier. Source: Internet
Additionally, for our email subscription we use a secure double opt-in subscription method. Source: Internet
A geofence is most commonly defined within the code of a mobile application, especially since users need to opt-in to location services for the geofence to work. Source: Internet
But secure email provider Protonmail, which was among the service providers hit by the Telstra routing hijack, out that RPKI is opt-in and will only work if every network on the internet agress to abide by it. Source: Internet
During the opt-in process, you’ll be able to turn on post-approvals for your group, which will apply to everyone, including new members and non-members,” Facebook said in a post. Source: Internet
Further, while the companies say that the effort is opt-in, it’s difficult to know how the program might influence policy. Source: Internet