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Trapdoor vs Undefined - What's the difference?

trapdoor | undefined |

As a noun trapdoor

is a hinged or sliding door set into a floor or ceiling.

As an adjective undefined is

lacking a definition or value.

trapdoor

English

(wikipedia trapdoor)

Alternative forms

* trap door * trap-door

Noun

(en noun)
  • A hinged or sliding door set into a floor or ceiling.
  • (theater) Such a trap set into the floor of a stage to allow fast exits and entrances.
  • (computing) A secret method of obtaining access to a program or online system; a backdoor.
  • (mathematics, cryptography) The special information that permits the inverse of a trapdoor function to be easily computed.
  • (mining) A door in a level for regulating the ventilating current; weather door.
    • (Raymond)

    Synonyms

    * drop

    Derived terms

    * trapdoor spider

    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