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What does undefined mean?

Looking for the meaning or definition of the word undefined? Here's what it means.

Adjective
  1. Lacking a definition or value.
  2. (mathematics) That does not have a meaning and is thus not assigned an interpretation.
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Examples
Indeed, the role of journalists and the media in dealing with criminals or suspected felons is a grey area with undefined boundaries.
There are the pieces barely there in form, undefined and tentative, as if they were emerging from the confining blob of clay.
In this latest reply, however, you seem to be shifting the definition a bit to make it more vague and undefined.
The proof of this result is correct, but this is one of two places in the book where there are undefined terms and confusing misprints.
Towards the end, as he's dying of an undefined illness, we realize he picks up chicks by poisoning their pets but acting so super nice and stuff.
Maybe it was easier to scare people if the object of fear remained vague and undefined.

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