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Birthdate vs Undefined - What's the difference?

birthdate | undefined |

As a noun birthdate

is the year, month, and day of someone's birth; date of birth.

As an adjective undefined is

lacking a definition or value.

birthdate

English

Noun

(en noun)
  • the year, month, and day of someone's birth; date of birth

    • See also

    * birthday -- which may not imply a specific year

    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