Definition of "cornerstones" [cornerstones]

• Plural form of cornerstone. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "The acquaintances and friendships I made, both with authors and fans, helped me more than I can ever express -- from getting advice to learning the ropes, from finding empathy when things seemed bleak to sharing the joy of successes -- these first friends remain cornerstones of my sanity."
• "The two main cornerstones of Western economies are usury and speculation."
• "These then are the main cornerstones of our five-year plan-safety, regularity and reliability, passenger service and technological improvements."