What does anonymise mean?
Anonymise is a verb meaning to remove identifying information from data, documents, or records so that the people they concern can no longer be identified. It is most commonly encountered in contexts where privacy matters: medical research, academic studies, surveys, and large-scale data processing. A hospital might anonymise patient scans before sharing them for teaching purposes, or a researcher might anonymise interview transcripts before publication. The word is closely tied to modern debates about data protection and ethics, since true anonymisation — making re-identification impossible — is technically difficult to achieve. Anonymise is the standard British spelling, while American usage favours 'anonymize'; both derive from the Greek-rooted word 'anonymous', meaning 'without a name'. Related but distinct is pseudonymisation, where identifiers are replaced with reversible codes rather than removed outright. As concerns about surveillance and personal data grow, anonymise has become an increasingly important term in law, technology, and everyday language about privacy.
verbTo remove identifying information from data, documents, or records so that the individuals involved cannot be identified. It is chiefly used in research, medicine, and data processing contexts.
- To strip personal or identifying information from data or records so individuals cannot be identified.
"The researchers anonymised all patient records before publishing their findings."
"All survey responses were anonymised before being shared with the public."
"Hospitals routinely anonymise medical images before uploading them to teaching databases."
The word 'anonymous' comes from Greek roots meaning 'without a name' — and anonymise is simply the modern act of making something nameless, a practice now central to privacy law worldwide.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of anonymise
Anonymise derives from 'anonymous', which comes from the Greek 'anōnymos', meaning 'without a name' — formed from 'an-' (without) and 'ōnyma'/'onoma' (name). The verb form arose much later, in the twentieth century, as computing and statistical research created a practical need for a word describing the removal of names from records. It shares its root with related words such as anonymity, anonymously, and pseudonym, all built on the same Greek name-related stem.
Related word forms
How anonymise is actually used
Anonymise is the standard British spelling; in American English the same word is typically spelled 'anonymize'. Both are pronounced identically apart from accent differences. The word carries a neutral-to-positive connotation, associated with ethical research practice and data protection.
Easily confused with anonymise
Pseudonymising replaces identifiers with pseudonyms that can potentially be reversed with a key, whereas anonymising removes identifiers so re-identification is not possible.