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Fluidity vs Undefined - What's the difference?

fluidity | undefined |

As a noun fluidity

is (uncountable) the state of being fluid rather than viscous.

As an adjective undefined is

lacking a definition or value.

fluidity

English

Noun

  • (uncountable) The state of being fluid rather than viscous
  • (countable) A measure of the extent to which something is fluid. The reciprocal of its viscosity.
  • The quality of being fluid or free-flowing
  • *{{quote-news
    • , year=2012 , date=June 19 , author=Phil McNulty , title=England 1-0 Ukraine , work=BBC Sport citation , page= , passage=Either side of Rooney's fluffed chance, it was a tale of Ukrainian domination as they attacked England down both flanks and showed the greater fluidity of the teams.}}

    Antonyms

    *viscosity

    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