big bang theory


Definition of big bang theory

: a theory in astronomy: the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density — compare steady state theory

Examples of big bang theory in a Sentence

Recent Examples on the Web Science has already yielded lots of answers, including the theory of evolution, the genetic code, quantum mechanics, general relativity and the big bang theory. John Horgan, Scientific American, 7 Aug. 2021 The big bang theory The entertainment business’s original script was simple. The Economist, 14 Nov. 2019 The old big bang theory as developed by Georges Lemaître, [George] Gamow and others is based on Einstein's theory of general relativity. Alexander Hellemans, Scientific American, 24 May 2018 If the big bang theory is an explanation on how the universe was created, then what existed before the big bang occurred? Dan Vergano,, 14 Mar. 2018 The title came from our whole thing, which is like the big bang theory. Andrew Dansby, Houston Chronicle, 24 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'big bang theory.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of big bang theory

1955, in the meaning defined above

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The first known use of big bang theory was in 1955

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Cite this Entry

“Big bang theory.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2022.

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