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Similarity vs Undefined - What's the difference?

similarity | undefined |

As a noun similarity

is closeness of appearance to something else.

As an adjective undefined is

lacking a definition or value.

similarity

English

Noun

(similarities)
  • Closeness of appearance to something else.
  • (philosophy) The relation of sharing properties.
    • Hardly is there a similarity detected between two or three facts, than men hasten to extend it to all. — Sir W. Hamilton.

    Synonyms

    * resemblance

    Related terms

    * similar

    See also

    * similitude * likeness * alikeness

    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