persistence

noun4

1. •
   The property of being persistent.

   • You've got to admire her persistence. She's asked him out every day for a month even though she keeps turning him down.
2. •
   Of data, the property of continuing to exist after the termination of the program.

   • Once written to a disk file, the data has persistence: it will still be there tomorrow when we run the next program.
3. •
   Continuation of the previous day's weather (particularly temperature and precipitation statistics).
4. •
   The number of times an operation can be iteratively applied to a number before it reaches a permanently constant state.

   • The persistence of the number 39 under the operation of multiplying the digits of the number is three, because 3x9 = 27, 2x7 = 14, and 1x4 = 4, and no further iterations will change the number again.