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undefined

The English word “undefined” has 4 meanings listed here.

adjective

  1. Lacking a definition or value.
  2. That does not have a logically sound meaning within a specific formal system and is thus not assigned an interpretation.
  3. That behaves unreliably due to dependence on an uninitialized value or inconsistently ported code.

noun

  1. An undefined value.

Etymology

From un- + defined.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.