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Nickname vs Undefined - What's the difference?

nickname | undefined |

As a noun nickname

is nickname in the sense of screenname, handle.

As an adjective undefined is

lacking a definition or value.

nickname

Noun

(en noun)
  • A familiar, invented given name for a person or thing used instead of the actual name of the person or thing.
  • A kind of byname that describes a person by a characteristic of that person.
  • Synonyms

    * (familiar invented given name) handle, hypocoristic, moniker, nick, sobriquet, pet name * (byname) antonomasia, byname, cognomen

    Verb

    (nicknam)
  • To give a nickname to (a person or thing).
  • 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