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WordNet-Online 
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| Definitions from the WebTerm: Opt InDescription:"Opt in" refers to the process of voluntarily choosing to participate or subscribe to something, typically by providing consent or agreeing to a specific action. It is commonly used in the context of permission-based marketing or data collection. Sample Sentences:
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| opsonins opsonisation opsonization opsonize opssesed opssum opstacle opt-ed opt-in opt-out opt opt in opt out opt to optaion optation optative 
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