cornerstone

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun the fundamental assumptions from which something is begun or developed or calculated or explained
  2. noun a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
  3. noun a stone at the outer corner of two intersecting masonry walls

Etymology

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.

In classic literature

Synonyms

basis, base, foundation, fundament, groundwork

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