Jun 20, 2026 · The meaning of UNDEFINED is not defined. How to use undefined in a sentence.

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

– Daniel Schaffer Aug 2, 2010 at 18:09 3 See: How to check for undefined in javascript?, and whether a variable is undefined and How to handle ‘undefined’ in javascript – Shog9 Aug 3, 2010 at 8:47 3

Jan 10, 2026 · The undefined global property represents the primitive value undefined. It is one of JavaScript's primitive types.

Mar 13, 2024 · Undefined is a type of Data type in JavaScript. It is a primitive value undefined, when a variable is declared and not initialized or not assigned with any value.

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

Undefined behavior, computer code whose behavior is not specified under certain conditions Undefined value, a condition where an expression does not have a correct value Undefined variable, a variable …