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Authentication vs Undefined - What's the difference?

authentication | undefined |

As a noun authentication

is something which validates or confirms the authenticity of something.

As an adjective undefined is

lacking a definition or value.

authentication

English

Noun

(en noun) (wikipedia authentication)
  • something which validates or confirms the authenticity of something
  • (computing) proof of the identity of a user logging on to some network
  • a hallmark or assay-mark on a piece of metalwork

    • 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