Synonyms of the word

three-way

• adj. (attributive) relating to three different directions.
• n. Sexual activity involving three persons; a threesome; a ménage à trois.
• n. A serving of Cincinnati chili with spaghetti and cheese.

many-sided

• adj. Having many sides; polygonal.
• adj. Having many aspects.

multilateral

• adj. Having many sides or points of view.
• adj. Involving more than one party (often used in politics to refer to negotiations, talks, or proceedings…

triangular

• adj. Shaped like a triangle.
• adj. Of, or pertaining to, triangles.
• adj. Having a triangle as a base; as, a triangular prism, a triangular pyramid.
• adj. Having three elements or parties; trilateral, tripartite.

trilateral

• adj. Having three sides.

tripartite

• adj. In three parts.
• adj. Done by three parties (as an agreement).