A reaction step of a chemical reaction is defined as: "An elementary reaction, constituting one of the stages of a stepwise reaction in which a reaction intermediate is converted into the next reaction intermediate in the sequence of intermediates between reactants and products". Wikipedia

Elementary reaction,stage of a stepwise reaction in which a reaction intermediate (reactants for the first step) is converted into the next reaction intermediate (products for the last step) in the sequence of intermediates between reactants/products Wikidata