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Unused vs Undefined - What's the difference?

unused | undefined |

As adjectives the difference between unused and undefined

is that unused is not used while undefined is lacking a definition or value.

unused

English

Usage notes

The second pronunciation () pronunciation, which is acceptable for either sense and is normally used for the "not used" sense in all registers.

Adjective

(en adjective)
  • not used
    • I have two unused vouchers for a free meal.
  • not accustomed
    • I am unused to the dark nights of the countryside.

    Anagrams

    *

    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