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Definition of cornerstone

cornerstone

/ˈkɔːr.nɚ.stoʊn/
cor · ner · stone
Plural:cornerstones
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cornerstone Lexical Profile

cornerstone Game Scores & Validity

• noun

1

An important quality, principle, or feature upon which a particular system, relationship, or organization is based and depends.

Example

"Mutual trust and open communication are the cornerstone of any successful partnership."

2

A stone that forms the base of a corner of a building, joining two walls and often laid in a formal ceremony with an inscription recording the construction date.

Example

"The mayor was invited to lay the ceremonial cornerstone for the new public library."

Synonyms
View all synonyms for cornerstone

• Nearby Words

cornerback
cornered
cornerman
cornerstone
cornet
cornetfish
cornetto

Word Origin & Etymology

Formed in Middle English as a compound of 'corner' and 'stone', originally translating the Latin 'lapis angularis' in biblical passages referring to the principal foundation stone of a temple.

Cite this Entry

Wordmom. (2026). Definition of Cornerstone. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/cornerstone
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