Etymology
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big bang (n.)

hypothetical explosive beginning of the universe, developed from the work of astronomers Monsignor Georges Henri Joseph Édouard Lemaître and George Gamow; the phrase is first attested 1950 (said to have been used orally in 1949) by British astronomer Fred Hoyle (1915-2001) in an attempt to explain the idea in laymen's terms.

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Definitions of big bang

big bang (n.)
(cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe;
From wordnet.princeton.edu