What does cyber mean?
Cyber is an attributive adjective relating to computers, information technology, and the online or virtual worlds they create. In modern English it rarely stands alone; instead it acts as a productive combining element attached to other nouns, yielding familiar terms such as cyber attack, cyber crime, cybersecurity, cyberspace, and cyberpunk. Its connotations are largely neutral-to-negative when paired with crime or warfare, and neutral or even glamorous in cultural contexts like cyberpunk fiction. The word traces back to Norbert Wiener's 1948 term 'cybernetics' for the study of control systems, which itself derives from the Greek kybernan, meaning to steer or govern — the same root behind 'govern' via Latin. Because so much contemporary life unfolds online, cyber has become an essential shorthand for everything digital, making it one of the most recognizable and versatile prefixes in the language.
adjective (used attributively)Relating to or characteristic of the culture of computers, information technology, and virtual reality; of or existing in computer-mediated or online environments.
- Relating to computers, information technology, and the internet (as in cyber security).
- Of or existing in virtual or computer-simulated environments (as in cyberspace, a sense now usually treated within the compound word).
"The company hired a specialist to protect its networks against cyber threats."
"The bank warned customers about a wave of sophisticated cyber attacks targeting online accounts."
"Her novel imagines a future where entire cities exist only in cyber space."
Every time you say 'cyber,' you're echoing an ancient Greek word for a ship's helmsman — the same root that gave us 'govern.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cyber
Cyber derives ultimately from the ancient Greek verb kybernan, meaning 'to steer' or 'to govern,' the root of kybernetes ('helmsman'). The modern word arose through Norbert Wiener's 1948 book Cybernetics, which coined that name from the Greek for the science of control and communication in animals and machines. From cybernetics came the shortened prefix cyber-, which spread rapidly through computing culture from the 1960s onward, producing compounds like cyberspace and cyberpunk. The same Greek root passed into Latin as gubernare, giving English the unrelated-seeming words 'govern' and 'gubernatorial.'
Related word forms
How cyber is actually used
Cyber functions almost exclusively as an attributive adjective — it appears before another noun (cyber crime, cyber café) rather than predicatively ('the threat is cyber' sounds awkward). It is a productive combining element, spawning countless compounds like cyberpunk, cybersecurity, and cyberspace. In formal writing, some style guides now prefer solid compounds such as 'cybersecurity' over the hyphenated or spaced forms.
Easily confused with cyber
A cyborg is a fictional or hypothetical being that is part human and part machine, whereas cyber describes things relating to computers and online environments.
A cypher (cipher) is a code or encryption method, while cyber refers to computers and digital or virtual spaces.