Undefined

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

Other uses

• Undefined, something that lacks any definition
• Undefined citizenship, a post-Soviet form of statelessness in Estonia

See also

• Null (disambiguation)
• Void (disambiguation)
• Invalid (disambiguation)
• Definition (disambiguation)
• Definable (disambiguation)