0 to choose to be part of an activity, arrangement, etc.: --
1 the fact of choosing to take part in an activity, arrangement, etc. rather than being forced to take part: --
2 to choose to be part of an activity, arrangement, etc.: --
3 the fact that you do not have, receive, or join in something unless you choose to, or something that you do not have or receive unless you choose it: --
Users have to click to give the company permission to collect data about their online habits, a process called opt-in.
We have a company pensions policy where there is an opt-in instead of an opt-out.
opt-in feature/system/policy The social networking site has introduced an opt-in feature for customers.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.