Definition of "triangle" []

• The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon. (noun)
• Something shaped like such a figure: a triangle of land. (noun)
• Any of various flat, three-sided drawing and drafting guides, used especially to draw straight lines at specific angles. (noun)
• Music A percussion instrument consisting of a piece of metal in the shape of a triangle open at one angle. (noun)
• A relationship involving three people, especially a ménage à trois. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "After a long series of experiments, guided by his ideas of the genesis of geometric figures, Séguin became aware that the triangle is the figure most easily drawn."
• "The Moslems, I am told, cut three locks – a triangle is a favourite Moslem tattoo pattern."
• "Because when I go out on head coaching interviews and if I mention the word 'triangle,' it makes general managers and owners cringe."