noun. A derivative work consisting of two pieces of (generally digital) media joined together, such as a video clip with a different soundtrack applied for humorous effect, or a map overlaid with user-supplied data.

noun. A remix that combines two or more songs from different artists into one track.

noun. a Web application that combines data and/or functionality from more than one source.

"I think the term mashup has become so fast and loose for me that I am starting to apply it to just about everything that is remixed."

mashable  

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