KEYSTONE

• (noun) the central building block at the top of an arch or vault

  synonyms : headstone , key

• (noun) a central cohesive source of support and stability

  "faith is his anchor", "the keystone of campaign reform was the ban on soft money", "he is the linchpin of this firm"

  synonyms : anchor , backbone , linchpin , lynchpin , mainstay

WordNet® 3.0, © 2006 by Princeton University.

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