Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “firewall”

firewall

noun [C]
 
 
/ˈfaɪəwɔːl/
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)
What is the pronunciation of firewall?
Add Cambridge dictionaries to your browser to your website

More Business English definitions for “firewall”

Definitions of “firewall” in other dictionaries

Word of the Day

aptitude

a natural ability or skill

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More