persistent

adjective7

1. •
   Obstinately refusing to give up or let go.

   • She has had a persistent cough for weeks.
2. •
   Indefinitely continuous.

   • There have been persistent rumours for years.
3. •
   Lasting past maturity without falling off.

   • Pine cones have persistent scales.
4. •
   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.
5. •
   non-transient.
6. •
   Insistently repetitive.

   • There was a persistent knocking on the door.
7. •
   Describing a fractal process that has a positive Brown function