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Definition of Doomsday event
1. Noun. (context: cosmology astronomy) An occurrence which causes the end of the universe or which destroys the planet earth; a global cataclysm. ¹
2. Noun. A localized event causing widespread death or destruction within a specific geographical area. ¹
3. Noun. (figuratively) A disastrous occurrence. ¹
¹ Source: wiktionary.com