The reaction order is a term used in kinetics to describe the power to which the concentration of a reactant is raised in the _rate law_ expression. For a generic reaction: \[ aA + bB \rightarrow Products \] the rate law can be written as: \[ \text{Rate} = k[A]^m[B]^n \] where \(m\) and \(n\) are the reaction orders with respect to reactants A and B, respectively. The overall reaction order is the sum \(m + n\).