Bivalent is a term that refers to something that has two equally important or significant parts or aspects. Some synonyms of bivalent include dual, twofold, duplex, double, binary, and dipolar. Dual refers to something consisting of two parts or elements that are equal in importance or significance. Duplex, on the other hand, describes something consisting of two parts bound together. Double means having two parts that are similar or interconnected. Binary is a mathematical term that refers to something that is composed of two parts or elements, while dipolar refers to something having two poles or opposite charges.