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Referrer vs Undefined - What's the difference?

referrer | undefined |

As a noun referrer

is a person who refers another.

As an adjective undefined is

lacking a definition or value.

referrer

English

Noun

(wikipedia referrer) (en noun)
  • A person who refers another.

    • Derived terms

    * referer * rereferrer ----

    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