opt in Meaning in the Cambridge English Dictionary
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Meaning of “opt in” in the English Dictionary

"opt in" in British English

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opt in

phrasal verb with opt uk   /ɒpt/  us   /ɑːpt/ verb [I]
to ​choose to be ​part of an ​activity, ​arrangement, etc.: Company ​policy is to ​leave new ​workers out of the ​pensionscheme, ​unless they ​choose to ​opt in.

opt-innoun [C or U]

uk   /ˈɒpt.ɪn/  us   /ˈɑːpt-/
the ​fact of ​choosing to take ​part in an ​activity, ​arrangement, etc. ​rather than being ​forced to take ​part: It is an opt-in ​rather than an ​opt-outsystem, which ​means that ​permission must be ​sought on a case-by-case ​basis.
(Definition of opt in from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"opt in" in Business English

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opt in

phrasal verb with opt uk   us   /ɒpt/ verb [I]
to choose to be ​part of an ​activity, ​arrangement, etc.: Company ​policy is to ​leave new ​workers out of the ​pensionscheme, unless they choose to ​opt in.

opt-innoun [C or U]

uk   us  
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 ​companypermission to ​collectdata about their ​online habits, a ​process called opt-in. We have a ​companypensionspolicy where there is an opt-in instead of an ​opt-out.opt-in feature/system/policy The ​socialnetworkingsite has ​introduced an opt-in ​feature for ​customers.
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(Definition of opt in from the Cambridge Business English Dictionary © Cambridge University Press)
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