Etymology
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Big Ben (n.)

clock-bell in the Parliament tower in London, by 1861, generally said to have been named for Sir Benjamin Hall (1802-1867), first Chief Commissioner of Works, under whose supervision the bell was cast. The name later was extended to the clock itself and its tower.

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Definitions of Big Ben

Big Ben (n.)
clock in the clock tower of the Houses of Parliament, London;
From wordnet.princeton.edu