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Sinkhole vs Undefined - What's the difference?

sinkhole | undefined |

As a noun sinkhole

is (geology) a hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.

As an adjective undefined is

lacking a definition or value.

sinkhole

English

(wikipedia sinkhole)

Alternative forms

* sink hole

Noun

  • (geology) A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage
  • A depressed area in which waste or drainage collects.
  • (pinball) A hole in the playfield that rewards the player when the ball is guided into it.
  • * 1997 , Windows magazine (volume 8, issues 1-3)
    • Pro Pinball is as authentic as pinball has ever been on the PC. It's all here, from the ramps, bumpers and sinkholes to the satisfying "clack" when you make the high-score list.
  • (internet) A DNS server that has been configured to hand out non-routeable addresses for all domains, so that every computer that uses it will fail to get access to the real website.

    • Synonyms

    * cenote, doline, kettle hole, shakehole, sink, swallet, swallow hole

    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