The meaning of UNDEFINED is not defined. How to use undefined in a sentence.

UNDEFINED definition: 1. not clearly described, stated, or known: 2. not having been given a definition (= a statement…. Learn more.

Look up undefined in Wiktionary, the free dictionary.

Not defined or made clear.... Click for English pronunciations, examples sentences, video.

Jan 10, 2026 · You can use undefined and the strict equality and inequality operators to determine whether a variable has a value. In the following code, the variable x is not initialized, and the if …

Definition of undefined adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. not defined or explained. 2. indefinite in form or extent: an undefined feeling of sadness.

UNDEFINED definition: without fixed limits; indefinite in form, extent, or application. See examples of undefined used in a sentence.

Mar 31, 2024 · Although undefined and null have some functional overlap, they have different purposes. In the strictest sense, null represents a value intentionally defined as "blank," and undefined …

Dec 14, 2025 · (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation. The result of division by zero is undefined.