1. A disaster that has been avoided.
2. The name for a world-ending event that has been successfully averted by a (super)hero.
"The baby was about to throw an Apocalypse of a fit, but we found her favorite toy, and avoided the fit, so it turned into an Almostocalypse, instead."

Also, "We saved the world. It was an Almostocalypse."
by Language Guru 2015 February 16, 2014
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