Columbus Day /kəˈlʌmbəs-/ noun Learner's definition of COLUMBUS DAY
[singular]
: the second Monday in October observed as a legal holiday in many states of the U.S. in honor of the arrival of Christopher Columbus in the Bahamas in 1492哥伦布纪念日(美国许多州的法定假日,在十月的第二个星期一,纪念哥伦布1492年到达巴哈马群岛)