tri·an·gle 
/ˈtraɪˌæŋgəl/ noun
plural tri·an·gles /ˈtraɪˌæŋgəl/ noun [count] 1 : a shape that is made up of three lines and three angles — see picture at geometry; see also equilateral triangle, isosceles triangle, right triangle 2 : something that is shaped like a triangle
▪ She cut the sandwiches into triangles. ▪ a triangle of land 3 : a musical instrument that is made of a steel rod bent into the shape of a triangle and that you play by hitting with a metal rod 4 : a situation in which one member of a couple is involved in a romantic or sexual relationship with another person
▪ a love triangle 5 US : a usually plastic or metal device that is shaped like a triangle and used for drawing straight lines and angles —called also (Brit) set square
▪ She cut the sandwiches into triangles. ▪ a triangle of land
▪ a love triangle
