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Fictitious vs Undefined - What's the difference?

fictitious | undefined |

As adjectives the difference between fictitious and undefined

is that fictitious is not real; invented; contrived while undefined is lacking a definition or value.

fictitious

English

Adjective

(en adjective)
  • Not real; invented; contrived.
    • St. Mary Mead is a fictitious village from the books of Agatha Christie.

    Synonyms

    * imaginary, invented, contrived, fictive

    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