Question 1 · Quick check
keystone
CEFRC1
/ˈkiː.stəʊn/
noun
Türkçe translations
Translating…
In plain English
- 01
noun
The central stone that supports an arch.
- 02
noun
A crucial part that holds a system or plan together.
Examples
Environmentalists are opposing the Keystone XL pipeline.
Sex appeal is the keystone of our civilization.
At a glance
Sits at C1 on the CEFR scale
- Senses
- 5
- Parts of speech
- 1
- Citations
- 2
Deep Dive
noun
Extra meaningsA retail price that is double the cost price; a markup of 100%.
Something on which other things depend for support.
The top stone of an arch.
More examples
In contextTension between empirical and theoretical knowledge is keystone to sociological and to organizational theories, as early as in Marx's and Weber's frameworks.
The tunnel, which is 1,000 yd. long, had been closed to passenger traffic since November 17, 1949, after some of the keystones had worked loose.
Quick test
Two questions on this entry. Nothing is scored.
Practise this properly in the app, where the word comes back before you forget it.
Nearby
Origin
noun
From key + stone. Definition 4 (retail) possibly originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone".