Definition of "megademo"

megademo

noun
plural megademos
1. (demoscene) A large, long-running demo (audiovisual presentation), sometimes one that multiloads.
  Quotations
  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 […]
  2003, Ernest Adams, Break into the game industry: how to get a job making video games
  Twenty years after the release of the Atari ST, the atari[sic] demoscene proudly announces the release of the '20 years' megademo.
  2005, Kevin Savetz, “ST>Atari ST 20 years megademo released”, in comp.sys.atari.announce (Usenet)