Usually means: Central stone in an arch.
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We found 39 dictionaries that define the word keystone:

General (26 matching dictionaries)
  1. keystone: Merriam-Webster.com
  2. Keystone, keystone: Oxford Learner's Dictionaries
  3. keystone: American Heritage Dictionary of the English Language
  4. keystone: Collins English Dictionary
  5. keystone: Vocabulary.com
  6. Keystone, keystone: Wordnik
  7. keystone: Cambridge Advanced Learner's Dictionary
  8. Keystone, keystone: Wiktionary
  9. keystone: Webster's New World College Dictionary, 4th Ed.
  10. keystone: The Wordsmyth English Dictionary-Thesaurus
  11. keystone: Infoplease Dictionary
  12. Keystone, keystone: Dictionary.com
  13. keystone: Online Etymology Dictionary
  14. Keystone (album), Keystone (architecture), Keystone (beer brand), Keystone (disambiguation), Keystone (gasoline automobile), Keystone (limestone), Keystone (steam automobile), Keystone (train), Keystone, The Keystone: Wikipedia, the Free Encyclopedia
  15. Keystone: Online Plain Text English Dictionary
  16. keystone: Webster's Revised Unabridged, 1913 Edition
  17. keystone: Rhymezone
  18. keystone: AllWords.com Multi-Lingual Dictionary
  19. keystone: Webster's 1828 Dictionary
  20. keystone: Free Dictionary
  21. keystone: The Phrontistery - A Dictionary of Obscure Words
  22. keystone: Mnemonic Dictionary
  23. keystone: Dictionary/thesaurus
  24. Keystone (cask): Wikipedia, the Free Encyclopedia

Art (4 matching dictionaries)
  1. keystone: ArtLex Lexicon of Visual Art Terminology
  2. KEYSTONE: The Britannia Lexicon (Middle Ages Glossary)
  3. Glossary: Gothic Art and Architecture (No longer online)
  4. keystone: Glossary of Medieval Art and Architecture

Business (2 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Keystone (disambiguation), Keystone (passenger train), Keystone (train), keystone: Legal dictionary

Computing (2 matching dictionaries)
  1. keystone: CCI Computer
  2. Keystone (disambiguation), Keystone (passenger train), Keystone (train), keystone: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Keystone: Castle Terms

Slang (2 matching dictionaries)
  1. Keystone: Green’s Dictionary of Slang
  2. keystone: Urban Dictionary

Tech (2 matching dictionaries)
  1. Glossary of video terms (No longer online)
  2. Urban Conservation Glossary (No longer online)

(Note: See keystones as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (architecture) The top stone of an arch.
noun:  Something on which other things depend for support.
noun:  A native or resident of the American state of Pennsylvania.
noun:  (retail) A retail price that is double the cost price; a markup of 100%.
noun:  (baseball) The combination of the shortstop and second baseman.
verb:  (transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
verb:  (transitive, retail) To double the cost price in order to determine the retail price; to apply a markup of 100%.
noun:  A census-designated place in Colorado.
noun:  A city and town in Iowa.
noun:  A ghost town in North Dakota.
noun:  A town in South Dakota.

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