Recursive

adjective

1. Drawing upon itself, referring back.

   "The recursive nature of stories which borrow from each other"

2. Of an expression, each term of which is determined by applying a formula to preceding terms
3. Of a program or function that calls itself
4. (of a function) which can be computed by a theoretical model of a computer, in a finite amount of time
5. (of a set) whose characteristic function is recursive (4)