Transience means passing with time. Something which has the property of transience is said to be transient, or often simply a transient or transient state.Examples include:
A transient astronomical event is a phenomenon that is relatively short-lived by astronomical standards. Examples include supernovae, comets, and meteors.
Transient state .
A transient laborer is a type of temporary laborer
A feeling of transience, called Mono no aware, has been important in Japanese culture.
A transient screen is an element in user interface design.
Transience, a short story by Arthur C. Clarke.
A transgender person.