How did Wilhelm Ostwald define catalysis?

Wilhelm Ostwald defined catalysts as substances that change the velocity of a given chemical reaction without modifying the energy factors of the reaction.1

This definition was a significant advancement in the field of physical chemistry, as it implied that catalysts do not alter the position of chemical equilibrium in a reaction. Ostwald developed this understanding during the 1890s while investigating the temporal aspects of chemical reactions and reaction velocities. His foundational work in this area, along with his research on chemical equilibria, contributed to him being awarded the 1909 Nobel Prize for Chemistry.123