demoPronunciation: /ˈdɛməʊ/ informalTranslate demo | into French | into German | into Italian | into Spanish Definition of demo noun (plural demos) 1chiefly British a public demonstration:a peace demo 2a demonstration of the capabilities of something, typically computer software or a musical group: [as modifier]:a demo tape verb (demos, demoing, demoed) [with object] demonstrate the capabilities of (software or equipment). record (a song) for demonstration purposes:they’ve already demoed twelve new songsdemo in other Oxford dictionaries Definition of demo in the US English dictionary