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Meaning of keystone

key•stone

Pronunciation: (kē'stōn"), [key]
— n.
  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 calledSee(def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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