cornerstone
US /ˈkɔːr.nɚ.stoʊn/
UK /ˈkɔːr.nɚ.stoʊn/

名詞
1.
基礎, 要石
an important quality or feature on which a particular thing depends or is based
例:
•
Trust is the cornerstone of any strong relationship.
信頼はあらゆる強い関係の基礎である。
•
Education is the cornerstone of a prosperous society.
教育は豊かな社会の礎である。
2.
定礎石, 隅石
a stone that forms the base of a corner of a building, especially one laid at a formal ceremony
例:
•
The mayor laid the cornerstone for the new library.
市長は新しい図書館の定礎石を置いた。
•
The date of construction was carved into the cornerstone.
建設日は定礎石に刻まれていた。
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