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"opt-in" means option to buy-in or for inclusion. It is a "verb-phrase" that has become used as a "verb". Semantically speaking, as a verb, it means 'buy-in' or 'include' or 'participate'. The word 'opt' is dropped in the translation without harm to the intent because the inference is translated. firstname.lastname@example.org
Meaning-Based Translation by Mildred Larson,, 2nd Edition, 1998
Elizabeth Tu United States Local time: 16:27 Native speaker of: English, Chinese PRO pts in pair: 24
Explanation: This is a legal as well as business term. Basically it means "to choose to participate in something or to incorporate an optional legal provision in a document." For instance, to opt in a class action or settlement, or to include a provision set forth in the Convention on Contracts for the International Sale of Goods in a private international sales agreement. The term may also be used to denote a decision to join other persons in an arrangement to purchase a mutual fund or int'l currency option. When used in a web page, its precise meaning depends very much on its context. I believe it has something to do with signing in or accepting the terms posted on the web pages. For more detail discussions, please see my article "Selected New American Legal Terms Translated and Explained" published in "Chinese Translators Journal" 2000/4, July 2000.
Chinese Translators Journal, 2000/4, page 49 "Opt-in Provisions" Bryan Garner, A Dictionary of Modern Legall Usage.