Triangle
Part of speech: noun
Definition: A polygon with three sides and three angles. A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound. A triangular shaped piece of equipment used for gathering the balls into the formation required by the game being played. A love triangle. The structure of systems composed with three interrelated objects.
Example sentence: Everybody knows that the great reversed triangle of land, with its base in the north and its apex in the south, which is called India, embraces fourteen hundred thousand square miles, upon which is spread unequally a population of one hundred and eighty millions of souls.
Trilateral
Part of speech: adjective
Definition: Having three sides.