The phrase "most quaternate" refers to something that is divided into groups of four. Synonyms for this phrase could include "most quadrupled," "most quadripartite," or "most tetradic." Other synonyms that describe a similar concept could include "most quadrilateral," "most fourfold," or "most tetrahedral." These terms all suggest a division into four distinct parts or components. "Most quaternate" can refer to many different things, such as measurements, mathematical equations, or even groups of people. Whatever the context, these synonyms can help to describe the concept of things being divided into four.