What does biometric mean?
'Biometric' is an adjective describing anything related to the measurement of distinctive physical or behavioural characteristics of the human body — fingerprints, facial structure, iris patterns, voice, or gait — most often for the purpose of identifying individuals or verifying their identity. The word derives from the Greek roots 'bios' (life) and 'metron' (measure), reflecting its origins in the statistical study of biological variation before it became central to modern security technology. Today it appears most frequently in phrases like 'biometric data', 'biometric authentication', and 'biometric passport', as smartphones, airports, and border systems increasingly replace passwords and keys with scans of the body itself. While the term is technically neutral, it often evokes debate about privacy and surveillance, since biometric identifiers are permanent and cannot be changed if compromised. Its companion noun 'biometrics' names both the technology and the measured traits.
adjectiveRelating to the measurement and statistical analysis of unique physical or behavioural characteristics of the human body, such as fingerprints, facial features, iris patterns, or voice, typically used for identification and authentication.
- Relating to the measurement of unique physical or behavioural human characteristics, especially for identification or security purposes.
- (In older statistical usage) Relating to biometry, the statistical analysis of biological observations and phenomena.
"The airport introduced biometric screening to speed up passport control."
"Smartphones now unlock using biometric verification such as a fingerprint scan or face recognition."
"Early biometric studies in the late nineteenth century applied statistical methods to measurements of living organisms."
Your fingerprint was a password long before passwords existed — the word 'biometric' just gave that ancient idea its modern name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of biometric
'Biometric' combines two Greek roots: 'bios', meaning life, and 'metron', meaning measure. It emerged in the late nineteenth century alongside 'biometry', the branch of statistics founded largely through the work of Francis Galton and Karl Pearson that applied mathematical measurement to biological phenomena. As fingerprinting and other identification techniques developed in the same era, the term gradually shifted toward its modern sense of measuring bodily characteristics for personal identification, a meaning that expanded dramatically with digital scanning technology in the late twentieth and early twenty-first centuries.
Related word forms
How biometric is actually used
Primarily a technical term used in security, technology, and forensic contexts; it is neutral in tone but can carry privacy- or surveillance-related connotations depending on context. The noun form 'biometrics' commonly refers both to the technology field and to the measurable characteristics themselves.
Easily confused with biometric
Geometric relates to geometry and shapes, while biometric relates to measuring biological characteristics of living bodies.