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Definition of Big bang theory
1. Noun. (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.
Exact synonyms: Big-bang Theory
Generic synonyms: Scientific Theory
Category relationships: Cosmogeny, Cosmogony, Cosmology
Generic synonyms: Scientific Theory
Category relationships: Cosmogeny, Cosmogony, Cosmology