an international yachting trophy, originally offered as the Hundred Guinea Cup in 1851, but renamed for the yacht America, winner of it that year.
the yacht race itself, the oldest and most prestigious event in international sailing, now restricted to 12-meter yachts.
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British Dictionary definitions for America's Cup
an international yachting trophy, first won by the schooner America in 1851 and held as a challenge trophy by the New York Yacht Club until 1983
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012