Etymology

cornerstone

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Today it means: A stone forming the base at the corner of a building. Full definition →

Middle English corner ston
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The story

  1. Middle English · inherited fromcorner ston
  2. English todaycornerstone

From Middle English corner ston; equivalent to corner + stone. The figurative sense is in part after Psalm 118:22, and is also quoted several times in the New Testament.

Etymology from Wiktionary, CC BY-SA 4.0.