Big-Bang Theory

nounid 19897·updated May 18, 2026

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(cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature

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synonym: big bang theorybig-bang theory
alternatephrasing: Big Bang Theory
plural: Big-Bang Theories
possessive: Big-Bang Theory's
pluralpossessive: Big-Bang Theories'

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§1: (cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature

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