opt in (verb) a situation where a person is given the right to choose whether to be involved in an offer or scheme. "Many council tenants are given the right to opt in pursuant to the 'right to buy' legislation."
Synonyms: elect: "Many tenants elect to exercise the option to purchase their flats." choose: "Users of the computerised research service may choose to receive additional marketing information from the company."
Antonyms: opt out: "Data protection laws entitle users of the internet-based service to opt out of receiving marketing information from companies affiliated with the service." decline: "The employee declined the additional insurance protection offered by her employer."
opt in to receive e-mail
opt in to receive information
opt in to participate
optionee = optante