Meaning of “firewall” in the English Dictionary

"firewall" in British English

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firewallnoun [ C ]

uk /ˈfaɪə.wɔːl/ us /ˈfaɪə.wɔːl/

Examples from literature

  • Wise programmers often change code to fix a bug twice: once to fix the bug, and once to insert a firewall which would have arrested the bug before it did quite as much damage. 

(Definition of “firewall” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"firewall" in Business English

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firewallnoun [ C ]

uk /ˈfaɪəwɔːl/ us

IT a computer system or program that prevents someone from seeing or using information on a computer without permission, especially someone using the internet:

Without a firewall, all your files could be instantly accessible to any competent hacker from anywhere in the world.

BANKING, FINANCE a way of making sure that one part of banking does not affect another by separating the operations of the two, especially so that investment banking should not negatively affect the banking sector that ordinary people use:

One banking executive stated, "Creating a firewall between retail and investment operations may not be as simple as it first seems".

FINANCE →  Chinese wall

(Definition of “firewall” from the Cambridge Business English Dictionary © Cambridge University Press)