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You don't need to go that deep into the article. Just - emacs. Of course I know what it is, I had to google the name to find it's EditorMACroS

Pretty sure it stands for Eight Megabytes And Constantly Swapping, a literal description of its function. /s

http://www.catb.org/jargon/html/E/EMACS.html (which also pretty much has your definition, though it calls it "Editing MACroS".)