Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A pop-up advertisement that opens behind the active window of a web browser so that the advertisement is not usually seen until the active window is closed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A pop-up advertisement that appears behind the window that triggers its appearance, and thus can not be seen by the internet user until the initial window is closed.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[On the model of pop-up.]

Examples

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