corner stone


cor·ner·stone

also corner stone C0648200 (kôr′nər-stōn′)n.1. a. A stone at the corner of a building uniting two intersecting walls; a quoin.b. Such a stone when inscribed with the date of the start of the construction of the building.2. An indispensable and fundamental basis: the cornerstone of an argument.
Translations
pierre angulaire