double opt-in
(Internet, marketing) The situation where a subscriber to a newsletter etc. first provides their e-mail address and then receives a confirmation request to that address, requiring them to take further action (such as clicking a hyperlink) to activate the subscription.
Describing a leaf spring that has a single leaf
(mathematical analysis) A property of the set of real numbers, that for any real number there is always a natural number greater than that real number.
Prior to the development of a system of ethics.
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