transient

adjective

1
Passing or disappearing with time; transitory.
a transient pleasure
2
Remaining for only a brief time.
a transient view of a landscape
a transient disease
3
Decaying with time, especially exponentially.
4
unsteady, non-]-steady-state.
5
having a positive probability of being left and never being visited again.
6
Occasional; isolated; one-off
7
Passing through; passing from one person to another.
8
Intermediate.
9
Operating beyond itself; having an external effect.

1
Something that is transient.
2
A transient phenomenon, especially an electric current; a very brief surge.
3
A relatively loud, non-repeating signal in an audio waveform that occurs very quickly, such as the attack of a snare drum.

Also useful for “transient”:Unscrambler— Rearrange the letters in “transient”