A structure intended to commemorate something which either needs no commemoration or cannot be commemorated. The bones of Agammemnon are a show, And ruined is his royal monument,but Agammemnon's fame suffers no diminution in consequence. The monument custom has its _reductiones ad absurdum_ in monuments "to the unknown dead" -- that is to say, monuments to perpetuate the memory of those who have left no memory.
A building, pillar, stone, or the like, erected to preserve the remembrance of a person, event, action, etc.; as, the Washington monument; the Bunker Hill monument. Also, a tomb, with memorial inscriptions.