firewall

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Noun firewall has 3 senses

firewall - the application of maximum thrust; "he slammed the throttle to the firewall"
--₁ is a kind of drive, thrust, driving force
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
--₂ is a kind of security system
firewall - fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
--₃ is a kind of wall

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