Biformity is the state or condition of being two-formed or dual in nature. It is a term that is not commonly used, however, there are a number of synonyms or words that could be used in its place. Some of the alternatives for biformity include duality, two-sidedness, ambidexterity, bifurcation, dichotomy, multiplicity, polarity, twofoldness, and duplexity. These synonyms allude to the idea of two-ness or double-ness and could be used to describe anything that possesses a dual nature. Biformity, therefore, can be replaced with any of these synonyms depending on the context of use.