cornerstone
B2Formal, academic, professional; occasionally used in general contexts.
Definition
Meaning
The fundamental basis or essential part on which something is built or depends.
Literally, the stone at the corner of a building, often laid at a ceremony, that unites two walls and is foundational. Metaphorically, the indispensable and central element of a system, belief, or argument.
Linguistics
Semantic Notes
Primarily a count noun. Carries strong connotations of importance, indispensability, and foundational support. Its metaphorical use is more common than its literal architectural use in modern English.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning, spelling, or usage. The literal architectural term is equally understood.
Connotations
Equally strong connotations of fundamentality in both dialects.
Frequency
Slightly more frequent in American academic and political discourse, but the difference is marginal.
Vocabulary
Collocations
Grammar
Valency Patterns
[BE] the cornerstone of [NP][VERB] a cornerstone of [NP][NP] has a cornerstone in [NP]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “lay the cornerstone (of something)”
Usage
Context Usage
Business
"Customer satisfaction is the cornerstone of our long-term strategy."
Academic
"The principle of informed consent is a cornerstone of modern medical ethics."
Everyday
"Trust is the cornerstone of any good relationship."
Technical
"The cryptographic protocol forms the cornerstone of the system's security."
Examples
By Part of Speech
verb
British English
- The new policy was cornerstoned by the findings of the report.
- They aimed to cornerstone the agreement on mutual trust.
American English
- The treaty is cornerstoned by the principle of non-aggression.
- Her entire argument cornerstones on a single, shaky assumption.
adjective
British English
- The cornerstone policy faced significant opposition.
- They discussed the project's cornerstone objectives.
American English
- The cornerstone amendment was ratified in 1791.
- She outlined the company's cornerstone values.
Examples
By CEFR Level
- The school's cornerstone is kindness to everyone.
- The old church has a big stone in the corner—it's the cornerstone.
- Hard work is the cornerstone of his success.
- The team's captain is the cornerstone of their defence.
- Free speech is often considered the cornerstone of a democratic society.
- The discovery of penicillin was a cornerstone in the development of modern medicine.
- The research paper's cornerstone argument was later debunked by new evidence.
- The peace accord was built on the cornerstone of mutual territorial recognition.
Learning
Memory Aids
Mnemonic
Imagine a large, important stone at the CORNER of a building. Everything else depends on it staying in place. So, a CORNERstone is the essential, supporting part of anything.
Conceptual Metaphor
IMPORTANT IDEAS/SYSTEMS ARE BUILDINGS (with a cornerstone as their essential, foundational part).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as "угловой камень" in purely metaphorical contexts; while understood, it's a calque. The direct equivalent "краеугольный камень" is standard and correct for both literal and figurative meanings.
- Do not confuse with "milestone" (веха) which marks progress, not foundation.
Common Mistakes
- Using it to mean simply 'an important part' rather than 'the *most fundamental* part'.
- Misspelling as two words: *corner stone*.
- Using with indefinite article for a unique concept: ?'He is a cornerstone of the team' is acceptable, but 'He is the cornerstone' is stronger.
Practice
Quiz
In which of the following sentences is 'cornerstone' used INCORRECTLY?
FAQ
Frequently Asked Questions
It is almost always written as one word: 'cornerstone'. The two-word form 'corner stone' is archaic and refers literally to a stone at a corner.
Yes, though less common. You can say 'Prejudice was the cornerstone of their ideology.' It emphasises fundamentality, not positive quality.
Both are metaphorical. 'Foundation' is broader, implying the whole base. 'Cornerstone' is more specific, suggesting the single, most crucial element that aligns and supports the rest.
It is very rare and considered non-standard or jargonistic by most dictionaries. It's better to use 'base', 'found', or 'ground' (e.g., 'The theory is based on...' rather than 'cornerstoned on...').