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1 definition found From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]: tail recursion When the last thing a function (or procedure) does is to call itself. Such a function is called tail recursive. A function may make several recursive calls but a call is only tail-recursive if the caller returns immediately after it. E.g. f n = if n < 2 then 1 else f (f (n-2) + 1) In this example both calls to f are recursive but only the outer one is tail recursive. Tail recursion is a useful property because it enables {tail recursion optimisation}. If you aren't sick of them already, see recursion and {tail recursion}. [Jargon File] (2006-04-16)