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.
- 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.