Recursive
WordNet

(1)   Of or relating to a recursion
WiktionaryText

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
Example: the factorial function -
$f\left(0\right) = 1$
$f\left(n\right) = n \times f\left(n-1\right)$ where n is any natural number greater than 0
4. which can be computed by a theoretical model of a computer, in a finite amount of time
5. whose characteristic function is recursive (4)