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Instability vs Undefined - What's the difference?

instability | undefined |

As a noun instability

is (uncountable) the quality of being unstable.

As an adjective undefined is

lacking a definition or value.

instability

English

Noun

(wikipedia instability)
  • (uncountable) The quality of being unstable.
  • (physics, countable) A state that is not in equilibrium, or in which a small change has a large irreversible effect.

    • Synonyms

    * volatility

    Related terms

    * instable * stability

    See also

    * disequilibrium

    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