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Undefined refers to something that lacks definition.

Undefined may also refer to:



  • 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, a function or variable lacking a declaration
  • Undefined, a variable lacking initialization
  • Undefined, an unavailable linker symbol (function, or global variable)

Other uses[edit]

See also[edit]