big bang theory

noun

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, Cincinnati.com, 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

Learn More About big bang theory

Time Traveler for big bang theory

Time Traveler

The first known use of big bang theory was in 1955

See more words from the same year

Dictionary Entries Near big bang theory

big bang

big bang theory

Big Bear

See More Nearby Entries 

Statistics for big bang theory

Cite this Entry

“Big bang theory.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/big%20bang%20theory. Accessed 8 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!