<p><strong>Noun</strong></p><ul><li>A partition made of fireproof material to prevent the spread of a fire from one part of a building or ship to another or to isolate an engine compartment, as on a plane, automobile, etc.</li><li>A person, thing, or event that acts as a barrier or protection against something undesirable: The new employee handbook should create a firewall against unethical business conduct.</li><li>Digital Technology: an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system.</li></ul>