What does undef mean in Miscellaneous?

This page is about the meanings of the acronym/abbreviation/shorthand undef in the field in general and in the Miscellaneous terminology in particular.

undefined

Miscellaneous

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Definition

What does undef mean?

undefined, vague(adj)
not precisely limited, determined, or distinguished

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"undef." Abbreviations.com. STANDS4 LLC, 2015. Web. 7 Jul 2015. <http://www.abbreviations.com/term/1418823>.