a national monument in Arlington National Cemetery in Virginia, US, where soldiers whose names were not known are buried from World Wars I and II, the Korean War, and the Vietnam War. It represents all the US people who died in those wars.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.