cornerstone

US /ˈkɔːr.nɚ.stoʊn/
UK /ˈkɔːr.nɚ.stoʊn/
"cornerstone" picture
1.

pierre angulaire, fondement

an important quality or feature on which a particular thing depends or is based

:
Trust is the cornerstone of any strong relationship.
La confiance est la pierre angulaire de toute relation solide.
Education is the cornerstone of a prosperous society.
L'éducation est la pierre angulaire d'une société prospère.
2.

pierre angulaire, première pierre

a stone that forms the base of a corner of a building, especially one laid at a formal ceremony

:
The mayor laid the cornerstone for the new library.
Le maire a posé la première pierre de la nouvelle bibliothèque.
The date of construction was carved into the cornerstone.
La date de construction était gravée dans la pierre angulaire.