transience
/trænˈsɪns/; /trænzˈɪns/Definitions
1. noun
The state or quality of being transitory; a short-lived or fleeting state of existence.
“The transience of human life is a common theme in many literary works.”
2. noun
A period of short duration or a brief stage in a process.
“The transience of the summer season made the vacation feel all too brief.”
3. noun
The act of passing from one place or state to another.
“The transience of the river’s course was a challenge for the engineers designing the dam.”