Definition of "popup" []

• A pop-up (noun)
• A pop-up advertisement (noun)

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• "Here's the rub, these are temporary stores right, you're going to see what they called popup stores."
• "Each group popup is dynamically resized via “glide” animation — based somewhat on the Aero Peek feature in Windows 7 — to fit to the size of the text to be shown, making movement across the task bar seamless."
• "Everytime i see her name popup in facebook or i see her online in my chatlist, im on a downward spiral."