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Usefulness vs Undefined - What's the difference?

usefulness | undefined |

As a noun usefulness

is the quality of being useful, to which extent something is useful.

As an adjective undefined is

lacking a definition or value.

usefulness

English

Noun

(-)
  • the quality of being useful, to which extent something is useful
    • The usefulness of his latest reorganisation has been disputed.

    See also

    * beauty

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined