UNDEFINED Definition & Meaning - Merriam-Webster
May 23, 2026 · The meaning of UNDEFINED is not defined. How to use undefined in a sentence.
UNDEFINED | definition in the Cambridge English Dictionary
UNDEFINED meaning: 1. not clearly described, stated, or known: 2. not having been given a definition (= a statement…. Learn more.
What Is Undefined? - Computer Hope
Sep 7, 2025 · The meaning of undefined with an overview, related terms, and examples from programming. Understand how undefined variables can lead to common error messages.
UNDEFINED definition in American English | Collins English ...
not given meaning or significance, as by a definition; not defined or explained an undefined term
Undefined - Wikipedia
Look up undefined in Wiktionary, the free dictionary.
How can I check for "undefined" in JavaScript? - Stack Overflow
If it is undefined, it will not be equal to a string that contains the characters "undefined", as the string is not undefined. You can check the type of the variable:
Undefined - definition of undefined by The Free Dictionary
1. not defined or explained. 2. indefinite in form or extent: an undefined feeling of sadness.