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Open English Wordnet
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Nouns
(n)
firewall
(colloquial) the application of maximum thrust
“he moved the throttle to the firewall”
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(n)
firewall
(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet
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(n)
firewall
a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
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