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Touchstone vs Undefined - What's the difference?

touchstone | undefined |

As a noun touchstone

is a stone used to test the quality of gold alloys.

As an adjective undefined is

lacking a definition or value.

touchstone

English

Noun

  • A stone used to test the quality of gold alloys.
  • A standard of comparison or evaluation.
  • * South
    • The foregoing doctrine affords us also a touchstone for the trial of spirits.

    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