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Expressivity vs Undefined - What's the difference?

expressivity | undefined |

As a noun expressivity

is (uncountable) the quality of being expressive.

As an adjective undefined is

lacking a definition or value.

expressivity

English

Noun

(en-noun)
  • (uncountable) The quality of being expressive.
  • (genetics) The degree to which a gene affects or can affect an organism.

    • See also

    * ("expressivity" on Wikipedia)

    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