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keystone

used in a sentence
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Definition something of importance upon which other things depend

or:

architecture or masonry:  the central building block at the top of an arch or vault (providing pressure to lock the other blocks into place)
  • the keystone of campaign reform was the ban on soft money
keystone = something of importance upon which other things depend
  • Friendship with Canada is the keystone in the arch of America's foreign relations.
  • The arch was reinforced with steel because the keystone was deteriorating.
  • According to lore, the brotherhood had created a keystone—an engraved tablet that revealed the final resting place of the brotherhood's greatest secret...
    Dan Brown  --  The Da Vinci Code
  • keystone = something of importance upon which other things depend
  • It was the keystone to the whole structure of deception, the parallax that would draw Carlos out of position into their sights.
    Robert Ludlum  --  The Bourne Identity
  • The archway was forty feet from cobble to keystone and still dwarfed by the walls, which rose a hundred feet above even the tallest trees.
    Henry H. Neff  --  The Maelstrom
  • BUT," and now he paused and looked fixedly at Belknap, "and this is the keystone of the whole thing—if this won't hold water, then down we go!
    Theodore Dreiser  --  An American Tragedy
  • It was the keystone that had held the whole cathedral up.
    Donna Tartt  --  The Goldfinch
  • There were plastic bags filled with Keystone beer cans all over the house and the tiny front yard.
    Scott Pratt  --  An Innocent Client
  • So we keep Alex away from our keystone, as far away from us as possible, but we give him our marker.
    Robert Ludlum  --  The Bourne Ultimatum
  • She must have been feeling like a Keystone Kop.
    Michael Lewis  --  The Blind Side
  • There was a general shout of outrage, and then we recommended the building of Leper's triumphal arch around Brinker's keystone.
    John Knowles  --  A Separate Peace
  • The keystone of the arch crashed almost on their heels, and the wall above crumbled, and fell in ruin.
    J.R.R. Tolkien  --  The Return of the King
  • They are all important, but they are not the keystone.
    Robert A. Heinlein  --  Tunnel In the Sky
  • The door was studded, and the keystone of the arch was a mask.
    Thomas Hardy  --  The Mayor of Casterbridge
  • We were the Keystone Kops of the sea.
    Jack Gantos  --  Hole in My Life
  • The keystone of the state's case was the six-page Plan of Action confiscated in the Rivonia raid.
    Nelson Mandela  --  Long Walk to Freedom
  • Keystone should be so lucky.
    Robert Ludlum  --  The Bourne Supremacy
  • What was his death but the keystone of a gloomy arch removed, and now the arch begins to fall in a thousand fragments, each crushing and mangling piecemeal!
    Charles Dickens  --  Bleak House
  • As I'm sure you are aware, Eragon is the keystone of our hopes.
    Christopher Paolini  --  Brisingr

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