Compare with first order reaction and second order reaction. A reaction with a reaction rate that does not change when reactant concentrations change.
A reaction that proceeds at a particular rate independently of the concentration of the reactant or reactants. ... (05 Mar 2000) ... 
Type: Term Definitions: 1. a reaction that proceeds at a particular rate independently of the concentration of the reactant or reactants.
A reaction with a reaction rate that does not change when reactant concentrations change. See also: First Order Reaction, Reactants, Second Order Reaction.