triangle

What is the Definition of triangle?

Noun:

1. a three-sided polygon
2. something approximating the shape of a triangle
3. a small northern constellation near Perseus between Andromeda and Aries
4. any of various triangular drafting instruments used to draw straight lines at specified angles
5. a percussion instrument consisting of a metal bar bent in the shape of an open triangle

Other meanings of triangle (synonyms, cognates).