The hydrolysis of ethyl acetate in acid medium is a I order reaction.
It is an example of pseudo unimolecular reaction.
CH3COOC2H5+H2O(excess)H+−−→CH3COOH+C2H5OH
Although it is termolecular (molecularity =3) reaction, its order is 1 as the concentration of H+ ion and H2O remains constant during the reaction.