firewall Meaning in the Cambridge English Dictionary
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Meaning of “firewall” in the English Dictionary

"firewall" in British English

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firewallnoun [C]

uk   us   /ˈfaɪə.wɔːl/
a ​device or ​program that ​stopspeople from ​seeing or using ​information on a ​computer without ​permission while it is ​connected to the internet
(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   us   /ˈfaɪəwɔːl/
IT a ​computersystem 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 ​competenthacker 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 ​investmentbanking should not ​negatively affect the ​bankingsector that ordinary ​people use: One ​bankingexecutivestated, "Creating a firewall between ​retail and ​investmentoperations may not be as simple as it first seems".
FINANCE →  Chinese wall
(Definition of firewall from the Cambridge Business English Dictionary © Cambridge University Press)
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