Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fireproof wall used as a barrier to prevent the spread of fire.
  • n. 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 v. Slang To apply maximum acceleration or thrust. Used of motor vehicles or aircraft.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
  • n. The software that monitors traffic in and out of a private network or a personal computer and allows or blocks such traffic depending on its perceived threat.
  • v. To protect with a firewall.
  • v. To block with a firewall.
  • v. To use maximum acceleration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (colloquial) the application of maximum thrust
  • n. a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
  • n. (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

Etymologies

From fire +‎ wall (Wiktionary)

Examples

  • If you have been using the Internet for any length of time, and especially if you work at a larger company and browse the Web while you are at work, you have probably heard the term firewall used.

    Wil's Ebay E-Store

  • Every day we continue to be fat, dumb, and happy with our IANA private ranges and doing port address translation at the firewall is another day further ensconced in the inebriation of IPv4.

    Five-year plan: 8 problems IT must solve

  • We probably need more than that, but a firewall is at least a first step.

    PMPM's playing with matches

  • ROBERTS: And Rudy Giuliani trying to play a strategy of being able to lose in Iowa and New Hampshire as Bill Clinton did and then in places like Florida, which he calls his firewall, New York and California, where he still has a tremendous base of support, being able to go that route to the nomination.

    CNN Transcript Dec 14, 2007

  • Comodo, the better (best?) firewall, is also not compatible, well there is a very new RC which is supposed to work, but it's no guarantee that it's working like the real releases.

    What’s New In The Windows 7 Release Candidate | Lifehacker Australia

  • In Q13, I hope the tiny percentage applying security patches excludes those getting pushed Windows updates automatically, and similarly I hope there are a lot of people unaware that their Windows firewall is on.

    Japanese senior computer and surfing habits: part 2 of 3

  • Shallow packet-inspection (like what your firewall is probably already doing) can prevent connectivity entirely.

    DPI: simplified and demystified

  • For this, we make similar security assumptions that the consumer-grade firewall is already making, namely that if the user has physical access to the device at the time the device is first turned on, then they must own the device.

    How Pogoplug Works

  • Juniper gained a big presence in firewall/VPN systems with its 2004 acquisition of NetScreen.

    Cisco's top 10 rivals

  • ZoneAlarm is a free software firewall from a company called Check Point.

    Five Best Windows Firewalls | Lifehacker Australia

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