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keystone

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key⋅stone

  [kee-stohn]
Use keystone in a Sentence
–noun
1. the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place.
2. something on which associated things depend: the keystone of one's philosophy.
3. Also called keystone sack. Baseball Slang. second base (def. 1).
Origin:
1630–40; key 1 + stone

Synonyms:
2. basis, principle, foundation, linchpin.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To keystone
Official Digi-Key Site
Search Our Huge Selection of Quality Electronic Components Here!
www.DigiKey.com
Keystone Electronics
Find the Keystone Electronics Parts You Need Today!
www.AlliedElec.com/Keystone
key·stone   (kē'stōn')   
n.  

  1. Architecture The central wedge-shaped stone of an arch that locks its parts together. Also called headstone.

  2. The central supporting element of a whole.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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