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Backie vs Undefined - What's the difference?

backie | undefined |

As a noun backie

is a ride on the back of a bicycle or motorbike.

As an adjective undefined is

lacking a definition or value.

backie

English

Noun

(en noun)
  • A ride on the back of a bicycle or motorbike.

    • References

    * Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22a+backie%22+bike&btnG=Search+Books&gws_rd=ssl]

    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