Word.ws English Dictionary

How to use undefined in a sentence

16 example sentences · adjective, noun

Undefined means lacking a definition or value. Example: “The result of division by zero is undefined.”

Examples of undefined by meaning

adjectiveLacking a definition or value.

  • We slid into our office, past two women discussing the "X factor," an apparently undefined quality their firm felt they lacked.1992, Lia Matera, Prior Convictions, page 121

adjectiveThat does not have a logically sound meaning within a specific formal system and is thus not assigned an interpretation.

  • The result of division by zero is undefined.
  • Within the set of real numbers, the square root of a negative number is undefined.

adjectiveThat behaves unreliably due to dependence on an uninitialized value or inconsistently ported code.

  • In C, relying on a variable's value right after a malloc call is undefined behvaior.

nounAn undefined value.

  • 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 Ten15.1988, Pearl Brereton, editor, Software Engineering Environments, Chichester, West Sussex: Ellis Horwood Limited, →ISBN, page 230
  • The Array object has these commonly-used properties: • .length: the number of items including undefineds.2017, Neos. Thanh, “Arrays”, in JavaScript Programming, →ISBN, page 36

More sentences with undefined

  • We've added hooks to allow undefined message types to be handled with custom code.From the entry hook
  • If not defined elsewhere, the sequence of evaluation of an expression is undefined.1995 June 29, Stefan Nobis, “C Set++ Bug?”, in comp.os.os2.programmer.misc (Usenet), retrieved 07 May 2022. From the entry assoziation
  • But, even in the design of these new media strategies, many experiences consumers are having are vague, disjointed, or undefined.2013, Brian Solis, WTF?: What's the Future of Business? Changing the Way Businesses Create Experiences, Wiley, →ISBN, page 153. From the entry Pinterest
  • Numbers, booleans, null, and undefined are immutable.2011, David Flanagan, JavaScript: The Definitive Guide. From the entry mutable
  • They died to decree that government of and by and for the PEOPLE (identity undefined) should never perish.1976, Akros, page 56. From the entry perisher
  • No one nationality appears to be in the absolute majority, resulting in the undefined ugliness caused by lack of pride or urban planning.1994, Christa Paula, The Road to Miran, HarperCollins, →ISBN, →OCLC, pages 205–206. From the entry Korla
  • 'It's not only undefined, it's incomprehensible.1990, Greg Bear, Heads. From the entry incomprehensible
  • Through the thicker mist that afternoon a white tilted cart sailed joltingly, taking its bearings from the various landmarks rather than from the undefined track.1902, Barbara Baynton, edited by Sally Krimmer and Alan Lawson, Bush Studies (Portable Australian Authors: Barbara Baynton), St Lucia…. From the entry tilted
  • At a further and undefined point in the future, the American force would shrink to about seven and later five brigades — all involved in overwatch missions.2007 September 11, Michael R. Gordon, “Petraeus Sees Bigger Role in Protecting Iraqi Civilians”, in New York Times. From the entry overwatch
  • As usual his adventurizing of the previously undefined is precipitate, cutting off the inductive process of inquiry with a trenchant deduction formulated on the basis of bookish assumptions.1992, Steven D. Hutchinson, Cervantine Journeys, page 151. From the entry adventurize

Meaning of undefined

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

Full definition of undefined

Questions about undefined in a sentence

How do you use undefined in a sentence?
Undefined is used as an adjective and noun. For example: “The result of division by zero is undefined.”
What is a short sentence with undefined?
“'It's not only undefined, it's incomprehensible.”
What does undefined mean?
Undefined means lacking a definition or value.

Source and license

Adapted from Wiktionary: undefined (page history and authors) and the entries each sentence comes from. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws chose the sentences, left out offensive ones and quotations older than 1900, and marked the word in each. Wiktionary data of 2026-09-02.

Last updated:

Cite this page: “How to use undefined in a sentence.” Word.ws, https://word.ws/sentences/undefined. Based on Wiktionary, CC BY-SA 4.0.