air gap: meaning, definition, pronunciation and examples
C2Technical / Formal
Quick answer
What does “air gap” mean?
A physical separation between a computer/network and other networks or devices, designed to prevent unauthorized data transfer.
Audio
Pronunciation
Definition
Meaning and Definition
A physical separation between a computer/network and other networks or devices, designed to prevent unauthorized data transfer.
Any intentional, physical space or barrier preventing the passage of something (e.g., air, electricity, data, sound) from one area to another. Can be literal (in plumbing, construction) or metaphorical (in cybersecurity).
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Spelling remains as two words. The concept is identical in both technical communities.
Connotations
In both varieties, in a tech context, it implies high security, isolation, and sometimes inconvenience. In non-tech contexts, it's a neutral engineering descriptor.
Frequency
Slightly more frequent in American English due to the larger volume of cybersecurity discourse, but the term is standard internationally in relevant fields.
Grammar
How to Use “air gap” in a Sentence
[system/network] + is + air-gappedto air-gap + [noun][noun] + with an air gapthe air gap between + [noun] and + [noun]Vocabulary
Collocations
Examples
Examples of “air gap” in a Sentence
verb
British English
- We must **air-gap** the backup server from the main network.
- The sensitive workstation was **air-gapped** as a precaution.
American English
- The protocol requires us to **air-gap** the election tabulation machines.
- All classified data is stored on **air-gapped** computers.
adverb
British English
- The data is stored **air-gapped**. (less common, often rephrased)
American English
- The system operates **air-gapped**. (less common)
adjective
British English
- They implemented an **air-gap** defence strategy.
- The machine is in an **air-gapped** environment.
American English
- We maintain an **air-gap** backup solution.
- The **air-gapped** network is located in a secure room.
Usage
Meaning in Context
Business
Discussed in IT security policies and risk management reports. 'The server containing financial records must be kept on an air-gapped network.'
Academic
Used in computer science, cybersecurity, and engineering papers. 'The study evaluated the efficacy of air gaps against novel exfiltration techniques.'
Everyday
Rare. Possibly in DIY contexts (e.g., plumbing, appliance installation) or when discussing extreme digital privacy. 'For ultimate safety, I keep my backup drive air-gapped.'
Technical
The primary domain. Precise meaning in cybersecurity, electrical engineering (spark gap), and mechanical systems. 'The SCADA system uses an air gap to prevent remote tampering.'
Vocabulary
Synonyms of “air gap”
Strong
Weak
Vocabulary
Antonyms of “air gap”
Watch out
Common Mistakes When Using “air gap”
- Using 'air gap' to mean a simple firewall or software-based disconnect (it must be physical).
- Writing it as one word ('airgap') – standard orthography is two words, though hyphenated 'air-gap' is common as a modifier or verb.
- Assuming it provides 100% absolute security (it can be breached via human error or hardware tampering).
FAQ
Frequently Asked Questions
No. While it prevents remote network-based attacks, it can still be compromised via physical access, infected removable media (USB drives), or social engineering.
No. The term originates from engineering (e.g., a spark gap in electrical systems, a gap in plumbing to prevent backflow). The cybersecurity usage is a metaphorical extension of this physical separation concept.
They are similar, but 'air-gapped' is stronger and more specific. A computer can be 'offline' temporarily but normally connected. An 'air-gapped' system is designed to never be connected, often with physical infrastructure enforcing that separation.
Methods include using removable media, compromising the supply chain before installation, using acoustic, thermal, or electromagnetic emissions to exfiltrate data, or exploiting human operators through coercion or deception.
A physical separation between a computer/network and other networks or devices, designed to prevent unauthorized data transfer.
Air gap is usually technical / formal in register.
Air gap: in British English it is pronounced /ˈeə ɡæp/, and in American English it is pronounced /ˈer ɡæp/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a computer sitting alone on a desk, with a visible **gap** of **air** all around it. Nothing can reach it unless you physically walk up and plug something in.
Conceptual Metaphor
SECURITY IS PHYSICAL DISTANCE / ISOLATION IS SAFETY. Treating a digital threat as a physical one that cannot cross empty space.
Practice
Quiz
In which scenario is an 'air gap' most accurately described?