cornerstone.
A stone forming the base at the corner of a building.
Meaning & usage
A stone forming the base at the corner of a building.
Such a stone used ceremonially, often inscribed with the architect's and owner's names, dates and other details.
The cornerstone on the Flatiron Building is set on the Fifth Avenue facade.
That which is prominent, fundamental, noteworthy, or central.
Exceptional service is the cornerstone of the hospitality industry.
That is the cornerstone of any meaningful debate about budgets and projects, regulations and policies.
Where this word comes from
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.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.