olemus
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Wiktionary:
1. drawing upon itself, referring back.
2. (mathematics, not comparable) of an expression, each term of which is determined by applying a formula to preceding terms
3. (computing, not comparable) of a program or function that calls itself
4. (computing theory, not comparable, of a function) which can be computed by a theoretical model of a computer, in a finite amount of time
5. (computing theory, not comparable, of a set) whose characteristic function is recursive (4)