persistent

1. (botany) Lasting past maturity without falling off.Examples: "Pine cones have persistent scales."; "The Jubulaceae have a leaf whose lobule, usually transformed into a water-sac, is normally very narrowly attached to the stem and to the dorsal lobe; indeed some Frullania taxa reproduce vegetatively by dropping the dorsal lobes, but not the lobules, and Neohattoria has caducous lobules but persistent lobes."

2. (computing) Of data or a data structure: not transient or temporary, but remaining in existence after the termination of the program that creates it.Examples: "Once written to a disk file, the data becomes persistent: it will still be there tomorrow when we run the next program."

3. (mathematics) Describing a fractal process that has a positive Brown function

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