"megademo" meaning in English

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  "etymology_text": "From mega- + demo.",
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          "ref": "2003, Ernest Adams, Break into the game industry: how to get a job making video games:",
          "text": "I asked him to look at an Amiga \"megademo\" I was working on at the time. When he later saw the demo, he was so impressed he hired me on the spot […]",
          "type": "quote"
        },
        {
          "ref": "2005, Kevin Savetz, “ST>Atari ST 20 years megademo released”, in comp.sys.atari.announce (Usenet):",
          "text": "Twenty years after the release of the Atari ST, the atari^([sic]) demoscene proudly announces the release of the '20 years' megademo.",
          "type": "quote"
        }
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        "A large, long-running demo (audiovisual presentation), sometimes one that multiloads."
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        "(demoscene) A large, long-running demo (audiovisual presentation), sometimes one that multiloads."
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        "demoscene",
        "engineering",
        "lifestyle",
        "mathematics",
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        "physical-sciences",
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  "etymology_text": "From mega- + demo.",
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          "ref": "2003, Ernest Adams, Break into the game industry: how to get a job making video games:",
          "text": "I asked him to look at an Amiga \"megademo\" I was working on at the time. When he later saw the demo, he was so impressed he hired me on the spot […]",
          "type": "quote"
        },
        {
          "ref": "2005, Kevin Savetz, “ST>Atari ST 20 years megademo released”, in comp.sys.atari.announce (Usenet):",
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          "type": "quote"
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        "(demoscene) A large, long-running demo (audiovisual presentation), sometimes one that multiloads."
      ],
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        "lifestyle",
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