A window that suddenly appears (pops up) when you select an option with a mouse or press a special function key. Usually, the pop-up window contains a menu of commands and stays on the screen only until you select one of the commands. It then disappears.
A special kind of pop-up window is a pull-down menu, which appears just below the item you selected, as if you had pulled it down.
Also see pop-up ad.
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