Usually means: Three sides enclosing three angles.
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We found 56 dictionaries that define the word triangle:

General (27 matching dictionaries)
  1. triangle: Merriam-Webster.com
  2. triangle, triangle: Oxford Learner's Dictionaries
  3. triangle: American Heritage Dictionary of the English Language
  4. triangle: Collins English Dictionary
  5. Triangle, triangle: Vocabulary.com
  6. Triangle, triangle: Wordnik
  7. triangle: Cambridge Advanced Learner's Dictionary
  8. Triangle: InfoVisual Visual Dictionary
  9. Triangle, triangle: Wiktionary
  10. triangle: Webster's New World College Dictionary, 4th Ed.
  11. triangle: The Wordsmyth English Dictionary-Thesaurus
  12. triangle: Infoplease Dictionary
  13. triangle: Dictionary.com
  14. triangle: Online Etymology Dictionary
  15. triangle: Cambridge Essential American English Dictionary
  16. The Triangle (North Carolina), The Triangle (TV miniseries), The Triangle (film), The Triangle (miniseries), The Triangle (newspaper), Triangle (Bengali film), Triangle (British-Australian film), Triangle (Buffy episode), Triangle (Buffy the Vampire Slayer), Triangle (Diaura album), Triangle (Israel), Triangle (Paris building), Triangle (Perfume album), Triangle (The Beau Brummels album), Triangle (The X-Files), Triangle (band), Triangle (chart pattern), Triangle (disambiguation), Triangle (film), Triangle (geometry), Triangle (instrument), Triangle (music), Triangle (musical instrument), Triangle (shape), Triangle: Wikipedia, the Free Encyclopedia
  17. Triangle: Online Plain Text English Dictionary
  18. triangle: Webster's Revised Unabridged, 1913 Edition
  19. The triangle, triangle: Rhymezone
  20. Triangle: AllWords.com Multi-Lingual Dictionary
  21. triangle: Webster's 1828 Dictionary
  22. triangle: Free Dictionary
  23. triangle: Mnemonic Dictionary
  24. triangle: Dictionary/thesaurus
  25. triangle: Wikimedia Commons US English Pronunciations

Art (8 matching dictionaries)
  1. triangle: ArtLex Lexicon of Visual Art Terminology
  2. Body Piercing Glossary (No longer online)
  3. Musical Instruments (No longer online)
  4. Essentials of Music (No longer online)
  5. Virginia Tech Multimedia Music Dictionary (No longer online)
  6. Body Piercing Glossary (No longer online)
  7. Triangle: Encyclopedia of Organ Stops
  8. Triangle: Dictionary of Symbolism

Business (5 matching dictionaries)
  1. triangle: Webster's New World Finance & Investment Dictionary
  2. INVESTORWORDS (No longer online)
  3. Construction Term Glossary (No longer online)
  4. Triangle: Investopedia
  5. Triangle (geometry), Triangle (mathematics), Triangle: Financial dictionary

Computing (1 matching dictionary)
  1. Triangle (geometry), Triangle (mathematics), triangle: Encyclopedia

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Triangle (geometry), Triangle (mathematics), triangle: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. triangle: Idioms

Science (5 matching dictionaries)
  1. Archaeology Wordsmith (No longer online)
  2. Triangle: Eric Weisstein's World of Mathematics
  3. triangle: MATH SPOKEN HERE!
  4. Glossary of Entomology (No longer online)
  5. triangle: PlanetMath Encyclopedia

Slang (2 matching dictionaries)
  1. triangle: Green’s Dictionary of Slang
  2. The Triangle, Triangle: Urban Dictionary

Sports (2 matching dictionaries)
  1. Hickok Sports Glossaries (No longer online)
  2. Triangle: Sports Definitions

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

(Note: See triangles as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (geometry) A polygon with three sides and three angles.
noun:  (US, Canada) A set square.
noun:  (music) A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound.
noun:  (cue sports) A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
noun:  A love triangle.
noun:  (systemics) The structure of systems composed with three interrelated objects.
noun:  A draughtsman's square in the form of a right-angled triangle.
noun:  (historical, usually in the plural) A frame formed of three poles stuck in the ground and united at the top, to which people were bound when undergoing corporal punishment.
noun:  Any of various large papilionid butterflies of the genus Graphium.
noun:  (rail transport) A triangular formation of railway tracks, with a curve on at least one side.
noun:  The area comprising the cities of Raleigh, Durham and Chapel Hill in North Carolina. Used with "the" except when attributive.
noun:  Ellipsis of Bermuda Triangle. [An area in the Atlantic Ocean where many ships and planes have disappeared under allegedly mysterious circumstances.]

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