Quadrivalent is an adjective that describes something having four parts or containing four elements. However, there are several alternatives to describe the same idea. One of the synonyms is tetradic, which means having or consisting of four parts, similar to quadrivalent. Another possible synonym is quadripartite, which describes something that is divided into four parts or sections. Additionally, quadruple is another synonym that suggests four-fold or consisting of four parts or components. Lastly, tetrapartite is also a synonym for quadrivalent, which means having or consisting of four equal parts. All of these synonyms perfectly encapsulate the concept of having or containing four parts or elements.