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firewall

(fīrˈwôl)

noun
  1. A fireproof wall used as a barrier to prevent the spread of fire.
  2. Computer Science Any of a number of security schemes that prevent unauthorized users from gaining access to a computer network or that monitor transfers of information to and from the network.
intransitive verb fire·walled, fire·wall·ing, fire·walls
Slang
To apply maximum acceleration or thrust. Used of motor vehicles or aircraft.

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