English Online Dictionary. What means undefined? What does undefined mean?
un- + defined
undefined (not comparable)
- Lacking a definition or value.
- (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
- The result of division by zero is undefined.
- (lacking a definition or value): indefinite, undefinable; see also Thesaurus:indistinct or Thesaurus:vague