noun

1. something set up to keep alive the memory of a person or event, as a tablet, statue, pillar, building, etc.
2. a structure surviving from a former period
3. a writing or the like serving as a memorial
4. 1. a work, production, etc. of enduring value or significance monuments of learning
   2. lasting or outstanding evidence or example
5. ☆ a stone shaft or other object set in the earth to mark a boundary
6. Obsolete
   1. a tomb; sepulcher
   2. a statue; effigy

Etymology: OFr < L monumentum < monere, to remind, warn: see monitor