Monolith/ˈmɑːnəlɪθ/ Definition 1 of 4Pro Tip 1/2Physical Monuments Refers to physical structures with historical, cultural, or symbolic significance. Tourists flocked to see the ancient monolith carved with runes. Pro Tip 2/2Immovable Impression Can imply something unchanging and permanent. His determination was a monolith that nothing could shake.