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What does opt-in mean?

Looking for the meaning or definition of the word opt-in? Here's what it means.

Adjective
  1. 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.
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Examples
Email messages sent to someone who has not opt-in or given permission to the sender.
Some felt that opt-in testing is a barrier to testing, while others felt that testing without proper consent could be harmful to individuals.
Industry can play a specific role since it can by turning the opt-in regime into a day-to-day business practice.
The Model Law does not include opt-in or opt-out clauses, but national legislators may consider whether to adopt such provisions.
British Columbia has had an opt-in mediation program that began in 1998 for motor vehicle personal injury matters.
If the opt-in results in emission levels below the benchmark, the operators will be able to sell part of their allocation.

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