undefined
adjective
- not defined
Wiktionary
adj
Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English defined English undefined From un- + defined.
- Lacking a definition or value.
“We slid into our office, past two women discussing the "X factor," an apparently undefined quality their firm felt they lacked.”
- That does not have a meaning and is thus not assigned an interpretation.
“The result of division by zero is undefined.”
noun
Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English defined English undefined From un- + defined.
- An undefined value.
“[Option:] · [PDP11:] F [BSD:] · [XE 2.3:] [1] [XE 3.0:] · [SIII:] · [COFF:] · [meaning:] make undefineds global”
“Every operation is defined completely either by delivering a value of some type depending only on the types of its operands or by causing some defined exception; there are no ‘undefineds’ in Ten15.”