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Bookshelf vs Undefined - What's the difference?

bookshelf | undefined |

As a noun bookshelf

is a shelf or shelves for storing books for easy visual reference.

As an adjective undefined is

lacking a definition or value.

bookshelf

English

Noun

(bookshelves)
  • A shelf or shelves for storing books for easy visual reference.

    • See also

    * bookcase * bookend

    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