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triangle
1: a polygon having three sides
— compare spherical triangle2 a: a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod b: a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees3: a situation in which one member of a couple is involved in a love affair with a third person
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