View your list of saved words. (You can log in using Facebook.)
Ceremonial building block, dated or otherwise inscribed, usually placed in an outer wall of a building to commemorate its dedication. Often the stone is hollowed out to contain newspapers, photographs, or other documents reflecting current customs, with a view to their historical use when the building is remodeled or demolished. Originally placed at a corner, the stone may today be placed elsewhere on the facade.
This entry comes from Encyclopædia Britannica Concise. For the full entry on cornerstone, visit Britannica.com.