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Definition of triangle noun from the Oxford Advanced American Dictionary

      

    triangle

     noun
    noun
    NAmE//ˈtraɪˌæŋɡl//
     
     
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  1. 1a flat shape with three straight sides and three angles; a thing in the shape of a triangle a right triangle Cut the dough into triangles.
  2. 2a simple musical instrument that consists of a long piece of metal bent into the shape of a triangle, which you hit with another piece of metal
  3. 3a situation involving three people in a complicated relationship a love triangle see also eternal triangle
  4. 4 an instrument for drawing straight lines and angles, made from a flat piece of plastic or metal in the shape of a triangle with one angle of 90°
See the Oxford Advanced Learner's Dictionary entry: triangle