Definitions

from The Century Dictionary.

  • noun The stone which lies at the corner of two walls, and unites them; specifically, the stone built into one corner of the foundation of an edifice as the actual or nominal starting-point in building.
  • noun Hence That on which anything is founded; that which is of the greatest or fundamental importance; that which is indispensable.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Alternative spelling of cornerstone.

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