Meaning of “the big bang theory” in the English Dictionary

american-english dictionary

(Definition of “the big bang theory” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"big bang theory" in American English

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big bang theorynoun [ U ]

/ˈbɪɡ ˈbæŋ ˌθɪər·i/

the very large explosion of a single mass of matter that many scientists believe was the beginning of the universe

(Definition of “big bang theory” from the Cambridge Academic Content Dictionary © Cambridge University Press)