Definition of Big Ben from the Oxford Advanced Learner's Dictionary

 

Big Ben

 
BrE
 
; NAmE
 
 
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the bell in the clock tower of the British Houses of Parliament. Its sound is well known because it has often been used in films, and it is used on British television and radio to introduce news broadcasts. Many people think wrongly that Big Ben is the name of the clock, or of the tower itself.