Undefined

/ʌn.dɪˈfaɪnd/

Meaning & Definition

adjective
Not clearly defined or having no precise meaning.
The project's goals remained undefined, leading to confusion among team members.
In mathematics, it refers to a value or expression that lacks a clear value or definition.
Dividing by zero results in an undefined value in the realm of arithmetic.
Not having distinct or clear boundaries or characteristics.
The undefined limits of the forest made it difficult for hikers to navigate.
Not assigned or recognized; ambiguous.
His role in the organization was left undefined, allowing him to take on various responsibilities.
In computer programming, referring to a variable or property that has not been initialized.
Accessing the undefined variable in the code caused the program to throw an error.

Etymology

From un- + defined.

Common Phrases and Expressions

undefined behavior
In programming, a term used for actions that are unpredictable and not explicitly defined by the specification.
undefined terms
Basic concepts in a field of study that are not defined but are assumed to be understood.

Related Words

define
To state or mark the boundaries of something.
definite
Having distinct limits; clear and specific.

Slang Meanings

Used to describe something that lacks clarity.
His explanation was totally undefined.
Referring to a situation that's confusing or not straightforward.
The plan was kind of undefined, so we didn’t know what to do next.