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key·stone
 keystone
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- pronunciation:
- ki
ston
- features:
- Word Explorer
| part of speech: |
noun |
| definition 1: |
the central stone at the top of an arch.
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| definition 2: |
something upon which other things depend; necessary and very important part.
His sense of humor was the keystone of his success as an author.- similar words:
- fundamental
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