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Optional vs Undefined - What's the difference?

optional | undefined |

As adjectives the difference between optional and undefined

is that optional is not compulsory; left to personal choice; elective while undefined is lacking a definition or value.

optional

English

Adjective

(-)
  • Not compulsory; left to personal choice; elective.
    • On that beach clothing is entirely optional .

    Antonyms

    * obligatory * mandatory * compulsory

    Related terms

    * option * optionality

    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