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Keystone: Definition, Examples, and Usage Guide (2 meaning)
Meaning 1：foundation (keystone)
keystone
/ˈkiːstoʊn/
n.
The most important part of a plan or idea that everything else depends on.
foundation
➕
/faʊnˈdeɪʃən/
n.
Refers to the fundamental principle or part on which everything else relies; the crucial basis of a system, plan, or idea.
📘 Details & Usage
📖 Root Explanation
Combination of 'key' (important) and 'stone' (rock), implying a critical block.
💡 Mnemonic
Key + stone: a key stone holds up the arch, just like a key idea holds up a plan.
📖 Example
In their business plan, customer trust was the keystone that made all their other strategies work.
In their business plan, customer trust was the keystone that made all their other strategies work.
🔗 Collocations
keystone of the theory – the most important part of the theory
keystone in the system – the essential component in the system
serve as a keystone – to act as the crucial supporting element
🔄 Synonyms
cornerstone (n.) – A stone that forms the base of a corner of a building, joining two walls; metaphorically, a fundamental element.
linchpin (n.) – A pin passed through the end of an axle to keep a wheel in position; used metaphorically for something that holds various elements together.
pillar (n.) – A tall vertical structure used as a support; figuratively, a person or thing that is a main support of something.
🚫 Antonyms
weak link (n.) – An element of a system or plan that is likely to fail or cause trouble.
peripheral element (n.) – A part that is not central or critical to the main structure or idea.
extra part (n.) – An additional component that is not necessary for the core function.
📖 Cultural Story
Central wedge in an arch that locks all stones together; this engineering term became a metaphor for a crucial element in any system since the 1800s.
Meaning 2：arch keystone (keystone)
keystone
/ˈkiːstoʊn/
n.
The central stone at the top of an arch that locks all the other stones in place.
arch keystone
➕
/ɑːrtʃ ˈkiːstoʊn/
n.
The central wedge-shaped stone at the top of an arch that holds all other stones in place, transferring weight and stabilizing the structure.
📘 Details & Usage
📖 Example
The old stone bridge is still standing after centuries because its keystone was perfectly carved and placed.
The old stone bridge is still standing after centuries because its keystone was perfectly carved and placed.
🔗 Collocations
arch keystone – the keystone located at the apex of an arch
keystone of the arch – the specific keystone belonging to a particular arch
carve a keystone – to shape a stone to serve as a keystone
🔄 Synonyms
lockstone (n.) – A stone that locks others in place, especially in an arch.
arch stone (n.) – Any stone used in the construction of an arch, but often used synonymously with keystone.
centre stone (n.) – The stone at the center or top of an arch, equivalent to a keystone.
🚫 Antonyms
base stone (n.) – The lowest stone of a structure, serving as a foundation rather than a locking element.
foundation stone (n.) – A stone used in the base of a building, not involved in arch compression.
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