undefined

English

Etymology

From un- +‎ defined.

Pronunciation

  • Audio (US):(file)

Adjective

undefined (not comparable)

  1. Lacking a definition or value.
    • 1992, Lia Matera, Prior Convictions, page 121:
      We slid into our office, past two women discussing the "X factor," an apparently undefined quality their firm felt they lacked.
  2. (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    The result of division by zero is undefined.

Synonyms

Antonyms

Derived terms

  • undefined behavior

Translations

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Translations to be checked

Noun

undefined (plural undefineds)

  1. (computing) An undefined value.
    • 1987, J. E. Lapin, Portable C and UNIX System Programming (Prentice-Hall Software Series), Englewood Cliffs, N.J.: Prentice-Hall, Inc., →ISBN, page 72:
      [Option:] · [PDP11:] F [BSD:] · [XE 2.3:] [1] [XE 3.0:] · [SIII:] · [COFF:] · [meaning:] make undefineds global
    • 1988, Pearl Brereton, editor, Software Engineering Environments, Chichester, West Sussex: Ellis Horwood Limited, →ISBN, page 230:
      Every operation is defined completely either by delivering a value of some type depending only on the types of its operands or by causing some defined exception; there are no ‘undefineds’ in Ten15.
    • 2017, Neos. Thanh, “Arrays”, in JavaScript Programming, →ISBN, page 36:
      The Array object has these commonly-used properties: • .length: the number of items including undefineds.
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