Undefined may refer to:
Mathematics
*
Undefined (mathematics), with several related meanings
**
Indeterminate form, in calculus
Computing
*
Undefined behavior, computer code whose behavior is not specified under certain conditions
*
Undefined value, a condition where an expression does not have a correct value
*
Undefined variable
* Undefined, a function or variable lacking a
declaration
* Undefined, a variable lacking
initialization
* Undefined, an unavailable
linker symbol (function, or global variable)
Other uses
* Undefined, something that lacks any
definition
A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definitio ...
*
Undefined citizenship, a post-
Soviet form of statelessness in Estonia
See also
*
Null (disambiguation)
*
Void (disambiguation)
*
Invalid (disambiguation)
Invalid may refer to:
* Patient, a sick person
* one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term)
* .invalid, a top-level Internet domain not intended for real use
As ...
*
Definition (disambiguation)
*
Definable (disambiguation)
In mathematical logic, the word definable may refer to:
* A definable real number
* A definable set In mathematical logic, a definable set is an ''n''-ary relation on the domain of a structure whose elements satisfy some formula in the first-ord ...
*
{{disambiguation