Cornerstone has several possible meanings and uses:

• A cornerstone is an important cultural component of western architecture, often indicating a building time and significant builders, enscribed on the stone. Some cornerstones include time capsules of the time a particular building was built. Cornerstones are found primarily in masonry-based architecture.

• Cornerstone is a relational database developed by Infocom and marketed by them and later by Activision.

• Cornerstone is the title of a magazine published by Jesus People USA in Chicago, Illinois. They also run an annual Christian music festival called Cornerstone Festival in Illinois and Florida.

• A cornerstone is a concept which provides the basic tools for understanding or manipulating a larger intellectual edifice.

• Cornerstone is a privately held economic and financial consulting firm with multiple offices in the United States.

• Cornerstone is a Danish heavy metal band.