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Observable vs Undefined - What's the difference?

observable | undefined |

As adjectives the difference between observable and undefined

is that observable is able to be observed while undefined is lacking a definition or value.

As a noun observable

is (physics) any physical property that can be observed and measured directly and not derived from other properties.

observable

English

Adjective

(en adjective)
  • Able to be observed.
  • * The strange new star was at the edge of the observable universe
  • Deserving to be observed.
  • * Easter is an observable holiday

    • Noun

    (wikipedia observable) (en noun)
  • (physics) Any physical property that can be observed and measured directly and not derived from other properties
    • Temperature is an observable but entropy is derived.
    In quantum mechanics, observables''' correspond to Hermitian operators. Also, they act a lot like random variables. Taking their average one may recover something resembling a classical '''observable .
    ----

    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