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Definitions of firewall:
- noun: the application of maximum thrust
Example: "He slammed the throttle to the firewall"
- noun: fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
- noun: (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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