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Adjective: undefined  ,ún-di'fInd
  1. Not precisely limited, determined, or distinguished
    "an undefined term"; "undefined authority"; "some undefined sense of excitement";
    - vague
Verb: undefine
  1. (computing) remove the definition of something, return to an undefined state

See also: indefinable, indefinite, undefinable

Antonym: defined

Encyclopedia: Undefined