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pop-up

The definition of a pop-up is a window that comes up on top of another window on a computer screen.

(noun)

An example of a pop-up is an unwanted window that comes up on a computer screen trying to sell a weight loss pill.

A pop-up is defined as a three-dimensional design in a book that lifts up on the page when the book is opened to the specially-designed page, or a temporary retail store.

(adjective)

An example of a pop-up is a page in a children's book that presents a three-dimensional forest when the book is opened; a pop-up book.
An example of a pop-up store is a gift shop set up during the holidays.

See pop-up in Webster's New World College Dictionary

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noun

Baseball pop ()
Comput. a window, containing a message or menu, that appears superimposed over the window in use, often, specif., one containing an advertisement from the Web

adjective

of or designating a book designed so that cut-out portions of an illustration lift when the book is opened to its page, producing a three-dimensional effect

See pop-up in American Heritage Dictionary 4

adjective

Emerging quickly from a recessed or concealed position when activated: pop-up gun emplacements.
Rising to form a three-dimensional structure when a page is opened: pop-up illustrations in a children's book.

noun