Bivalent

Bivalent may refer to:
 * Bivalent (chemistry), a molecule formed from two or more atoms bound together
 * Bivalent ligand, a ligand of two drug-like molecules
 * Bivalent (genetics), a pair of homologous chromosomes
 * Bivalent vaccine, a vaccine directed at two pathogens or two strains of a pathogen
 * Bivalent (engine), an engine that can operate on two different types of fuel
 * A verb with a valency of two
 * Principle of bivalence, a semantic principle in logic