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