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Luminance vs Undefined - What's the difference?

luminance | undefined |

As a noun luminance

is the quality of being luminous.

As an adjective undefined is

lacking a definition or value.

luminance

English

Noun

(wikipedia luminance) (-)
  • the quality of being luminous
  • the luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs

    • Synonyms

    *photometric brightness

    See also

    *brightness

    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