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 An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code."undefined variable." YourDictionary, n.d. Web. 24 July 2013. .
In some programming languages, an impl ...
* Undefined, a function or variable lacking a
declaration
Declaration may refer to:
Arts, entertainment, and media Literature
* ''Declaration'' (book), a self-published electronic pamphlet by Michael Hardt and Antonio Negri
* ''The Declaration'' (novel), a 2008 children's novel by Gemma Malley
Music ...
* Undefined, a variable lacking
initialization
* Undefined, an unavailable
linker symbol (function, or global variable)
Other uses
* Undefined, something that lacks
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)
Null may refer to:
Science, technology, and mathematics Computing
*Null (SQL) (or NULL), a special marker and keyword in SQL indicating that something has no value
*Null character, the zero-valued ASCII character, also designated by , often used ...
*
Void (disambiguation)
Void may refer to:
Science, engineering, and technology
* Void (astronomy), the spaces between galaxy filaments that contain no galaxies
* Void (composites), a pore that remains unoccupied in a composite material
* Void, synonym for vacuum, a s ...
*
Invalid (disambiguation)
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Definition (disambiguation)
A definition is a statement of the meaning of a term.
Definition may also refer to:
Science, mathematics and computing
* In computer programming languages, a declaration that reserves memory for a variable or gives the body of a subroutine
* D ...
*
Definable (disambiguation)
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