Definitions for: Recursion

[n] (mathematics) an expression such that each term is generated by repeating a particular mathematical operation

Webster (1913) Definition: Re*cur"sion (-sh?n), n. [L. recursio. See Recur.]
The act of recurring; return. [Obs.] --Boyle.

factorial 0 = 1
factorial n = n * factorial (n-1)

See Also: formula, rule