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opt in ['ɔpt'ɪn]
comp., MS	acconsentire esplicitamente (To explicitly consent to participate. Typically used in marketing programs and offerings, whereby an action (such as the use of personal information beyond the original, primary purpose for which it was collected) is not undertaken unless an individual explicitly consents. An element of choice)
opt-in
commun.	sistema opt-in

opt in: 2 phrases in 2 subjects

Medical	1
Politics	1