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   Big Bang

   /ˌbɪɡ ˈbaŋ/

   noun

   • 1. the rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
   • 2. (in the UK) the introduction in 1986 of major changes in trading on the Stock Exchange, principally involving widening of membership, relaxation of rules for brokers, and computerization.

   Word Origin 1940s: first used in 1949 by the British astrophysicist Sir Fred Hoyle (see Hoyle, Sir Fred), who actually disagreed with the theory, preferring the steady state model.

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