1. the fundamental principles or most important parts on which something is based
Usage: figurative use
2. stones that form the corner of a building, especially a ceremonial stone laid at a building’s foundation
Usage: literal architectural sense

Examples

• Trust and communication are the cornerstones of a strong marriage.
• The Constitution and Bill of Rights are cornerstones of American democracy.
• Hard work and dedication became the cornerstones of her success.
• The workers carefully placed the cornerstones before continuing construction.
• Education and healthcare are cornerstones of a thriving society.
• The ancient building’s cornerstones were carved with intricate designs.
• Innovation and quality control are the cornerstones of our business model.