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English definition of “pop-up”

pop-up

noun [C]    
E-COMMERCE, MARKETING an advertisement that is shown in a new window in front of the window that you are looking at on a website: We do not allow pop-ups of any kind on our website. → Compare pop-under
(also pop-up menu) IT a list of choices that is shown on a computer screen when the user asks for it: This pop-up can be displayed anywhere on the page with a right-click of the mouse.
(Definition of pop-up noun from the Cambridge Business English Dictionary © Cambridge University Press)
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