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Comeback vs Undefined - What's the difference?

comeback | undefined |

As a noun comeback

is comeback.

As an adjective undefined is

lacking a definition or value.

comeback

English

Noun

(en noun)
  • A return (e.g. to popularity, success, etc.) after an extended period of obscurity.
    • That fad went out with the eighties, but I think it's making a comeback .
  • * {{quote-news
    • , year=2011 , date=February 5 , author=Paul Fletcher , title=Newcastle 4 - 4 Arsenal , work=BBC citation , page= , passage=Newcastle produced a stunning comeback from 4-0 down to earn a draw that shocked title hopefuls Arsenal.}}
  • * {{quote-news
    • , year=2013 , date=December 6 , author= alim17 , title=Girls' Generation rumored to make a comeback in early 2014! , work=allkpop.com citation , page= , passage= According to rumors in the entertainment world on December 6, Girls' Generation will be making a comeback' next year with a masculine concept. They have supposedly decided on the title song in their new album and have begun filming the music video on December 6. It appears they have started preparing for a full-scale '''comeback'''! It will be the girls' first Korean ' comeback in a year since "I Got a Boy." }}
  • A retort or answer, particularly a quick or clever one.
    • I wish I had thought of a quick comeback for his comment.

    Usage notes

    In sense “reply”, more casual than (m) or the somewhat formal (m).

    Synonyms

    * (reply) rejoinder, retort

    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