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Expiration vs Undefined - What's the difference?

expiration | undefined |

As a noun expiration

is the act of expiring.

As an adjective undefined is

lacking a definition or value.

expiration

English

Noun

(-)
  • The act of expiring.
  • The act or process of breathing out, or forcing air from the lungs through the nose or mouth; as, respiration consists of inspiration and expiration; – opposed to inspiration.
  • Emission of volatile matter; exhalation.
  • The last emission of breath; death.
  • A coming to a close; cessation; extinction; termination; end.
  • That which is expired; matter breathed forth; that which is produced by breathing out, as a sound.

    • Usage note

    In most senses, mainly US; UK equivalent is expiry.

    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