The concept of reason is overloaded with all sorts of meanings ranging from reason as a god-like faculty to reason as a fixed entity endowed with a priori principles constituting all experience, actual as well as possible. Such a concept of reason is dynamized in the phenomenology of Husserl; and a phenomenological understanding of reason has to take into account its redefinition in phenomenology. The concepts reason, rationality get a new type of meaning in the phenomenological reflection.