When it comes to synonyms for the term "most trilateral", there are a few different options to choose from. Some possibilities might include "most tripartite", "most triangular", or "most three-sided". All of these terms convey the idea of something having three parts or aspects, much like a triangle. Additionally, you could also use the phrase "most ternary" to describe something that is composed of three elements or components. Ultimately, the choice of which synonym to use will depend on the context in which you are discussing the trilateral nature of something, as well as the specific nuances of meaning that each word might carry.