persistent

adjective

1. 1

   Obstinately refusing to give up or let go.

   “She has had a persistent cough for weeks.”

2. 2

   Insistently repetitive.

   “There was a persistent knocking on the door.”

3. 3

   Indefinitely continuous.

   “There have been persistent rumours for years.”

4. 4

   Lasting past maturity without falling off.

   “Pine cones have persistent scales.”

5. 5

   Of data or a data structure: not transient or temporary, but remaining in existence after the termination of the program that creates it.

   “Once written to a disk file, the data becomes persistent: it will still be there tomorrow when we run the next program.”

6. 6

   Describing a fractal process that has a positive Brown function

7. 7

   (stochastic processes, of a state) non-transient.